## Cost Price, Markup, Discount, & Profit and eTCL demo example slot calculator, numerical analysis

This page is under development. Comments are welcome, but please load any comments in the comments section at the bottom of the page. Please include your wiki MONIKER and date in your comment with the same courtesy that I will give you. Aside from your courtesy, your wiki MONIKER and date as a signature and minimal good faith of any internet post are the rules of this TCL-WIKI. Its very hard to reply reasonably without some background of the correspondent on his WIKI bio page. Thanks, gold 12Dec2018

## Introduction

gold Here is some eTCL starter code for Cost Price and Markup in calculator shell.

## Pseudocode Section

```       # using pseudocode
# possible problem instances,
initialize algorithm_result = 1.
check algorithm
f(solution) =? initial product
sticker marked_price =  cost_price * (( 100. + \$mark_up_percent -\$discount_percent)/100.)
mark_up_units = cost_price * (mark_up_percent/100.)
profits = sticker price - cost_price
total_profits_units = profit_units * total_items_sold
check_sum = a+b+c+d+e
set answers and printout with resulting values
pseudocode: need test cases > small,medium, giant
pseudocode: need testcases within range of expected operation.
pseudocode: are there any cases too small or large to be solved?```

### Testcases Section

In planning any software, it is advisable to gather a number of testcases to check the results of the program. The math for the testcases can be checked by pasting statements in the TCL console. Aside from the TCL calculator display, when one presses the report button on the calculator, one will have console show access to the capacity functions (subroutines).

#### Testcase 1

table 1printed in tcl wiki format
quantity value comment, if any
1:testcase_number
100.0 :cost price units
50.0 :markup percent
10.0 :sticker discount
10.0 :number of items sold
50.0 :answers: mark_up units
40.0 :profit on one item units
400.0 :total profits on all items units
140.0 :rounded sticker price units
140.00 :sticker price units

#### Testcase 2

table 2printed in tcl wiki format
quantity value comment, if any
2:testcase_number
50.0 :cost price units
50.0 :markup percent
10.0 :sticker discount
10.0 :number of items sold
25.0 :answers: mark_up units
20.0 :profit on one item units
200.0 :total profits on all items units
70.0 :rounded sticker price units
70.000 :sticker price units

#### Testcase 3

table 3printed in tcl wiki format
quantity value comment, if any
3:testcase_number
1000.0 :cost price units
50.0 :markup percent
10.0 :sticker discount
10.0 :number of items sold
500.0 :answers: mark_up units
400.0 :profit on one item units
4000.0 :total profits on all items units
1400.0 :rounded sticker price units
1400.0 :sticker price units

## Appendix Code

### appendix TCL programs and scripts

```        # pretty print from autoindent and ased editor
# Cost Price Markup calculator
# written on Windows XP on eTCL
# working under TCL version 8.5.6 and eTCL 1.0.1
# gold on TCL WIKI, 2mar2017
package require Tk
package require math::numtheory
namespace path {::tcl::mathop ::tcl::mathfunc math::numtheory }
set tcl_precision 17
frame .frame -relief flat -bg aquamarine4
pack .frame -side top -fill y -anchor center
set names {{} {cost price units :} }
lappend names {markup percent:}
lappend names {sticker discount: }
lappend names {number of items sold: }
lappend names {answers: mark_up units:}
lappend names {profit on one item units : }
lappend names {total profits on all items units: }
lappend names {sticker price units :}
foreach i {1 2 3 4 5 6 7 8} {
label .frame.label\$i -text [lindex \$names \$i] -anchor e
entry .frame.entry\$i -width 35 -textvariable side\$i
grid .frame.label\$i .frame.entry\$i -sticky ew -pady 2 -padx 1 }
proc about {} {
set msg "Calculator for Cost Price Markup
from TCL WIKI,
written on eTCL "
tk_messageBox -title "About" -message \$msg }
proc ::tcl::mathfunc::precision {precision float}  {
#  tcl:wiki:Floating-point formatting, [AM]
set x [ format "%#.5g" \$float ]
return \$x
}
proc calculate {     } {
global side1 side2 side3 side4 side5
global side6 side7 side8
global testcase_number
incr testcase_number
set side1 [* \$side1 1. ]
set side2 [* \$side2 1. ]
set side3 [* \$side3 1. ]
set side4 [* \$side4 1. ]
set side5 [* \$side5 1. ]
set side6 [* \$side6 1. ]
set side7 [* \$side7 1. ]
set side8 [* \$side8 1. ]
set side6 \$side1
set side7 \$side2
set cost_price \$side1
set mark_up_percent \$side2
set discount_percent \$side3
set total_items_sold \$side4
set marked_price [* \$cost_price [/ [+ 100. \$mark_up_percent [* -1. \$discount_percent] ] 100. ]]
set mark_up_units  [* \$cost_price [/  \$mark_up_percent 100. ]]
set discount_units [* \$cost_price [/  \$discount_percent 100. ]]
set profit_units [- \$marked_price \$cost_price]
set total_profits_units [* \$profit_units \$total_items_sold ]
set side5 \$mark_up_units
set side6 \$profit_units
set side7 \$total_profits_units
set side8 \$marked_price
}
proc fillup {aa bb cc dd ee ff gg hh} {
.frame.entry1 insert 0 "\$aa"
.frame.entry2 insert 0 "\$bb"
.frame.entry3 insert 0 "\$cc"
.frame.entry4 insert 0 "\$dd"
.frame.entry5 insert 0 "\$ee"
.frame.entry6 insert 0 "\$ff"
.frame.entry7 insert 0 "\$gg"
.frame.entry8 insert 0 "\$hh"
}
proc clearx {} {
foreach i {1 2 3 4 5 6 7 8 } {
.frame.entry\$i delete 0 end } }
proc reportx {} {
global side1 side2 side3 side4 side5
global side6 side7 side8
global testcase_number
console show;
puts "%|table \$testcase_number|printed in| tcl wiki format|% "
puts "&| quantity| value| comment, if any|& "
puts "&| \$testcase_number:|testcase_number | |&"
puts "&| \$side1 :|cost price units  |   |&"
puts "&| \$side2 :|markup percent   | |& "
puts "&| \$side3 :|sticker discount | |& "
puts "&| \$side4 :|number of items sold | |&"
puts "&| \$side5 :|answers: mark_up units  | |&"
puts "&| \$side6 :|profit on one item units |  |&"
puts "&| \$side7 :|total profits on all items units |  |&"
puts "&| \$side8 :|rounded sticker price units |  |&"
puts "&| [ ::tcl::mathfunc::precision 5 \$side8] :|sticker price units |  |&"
}
frame .buttons -bg aquamarine4
::ttk::button .calculator -text "Solve" -command { set side8 0 ; calculate   }
::ttk::button .test2 -text "Testcase1" -command {clearx;fillup 100.0  50.  10.0 10.0  50.0  40.   400.0  140.0}
::ttk::button .test3 -text "Testcase2" -command {clearx;fillup 50.0 50.0 10.0 10.00  25.0  20.0 200.0  70.0}
::ttk::button .test4 -text "Testcase3" -command {clearx;fillup 1000.0 50.0 10.0 10.0  500.0  400.0 4000.0 1400.0}
::ttk::button .clearallx -text clear -command {clearx }
::ttk::button .cons -text report -command { reportx }
::ttk::button .exit -text exit -command {exit}
pack .calculator  -in .buttons -side top -padx 10 -pady 5
pack  .clearallx .cons .about .exit .test4 .test3 .test2   -side bottom -in .buttons
grid .frame .buttons -sticky ns -pady {0 10}
. configure -background aquamarine4 -highlightcolor brown -relief raised -border 30
wm title . "Cost Price Markup Calculator"
# end of deck    ```

### Pushbutton Operation

For the push buttons, the recommended procedure is push testcase and fill frame, change first three entries etc, push solve, and then push report. Report allows copy and paste from console.

For testcases in a computer session, the eTCL calculator increments a new testcase number internally, eg. TC(1), TC(2) , TC(3) , TC(N). The testcase number is internal to the calculator and will not be printed until the report button is pushed for the current result numbers. The current result numbers will be cleared on the next solve button. The command { calculate; reportx } or { calculate ; reportx; clearx } can be added or changed to report automatically. Another wrinkle would be to print out the current text, delimiters, and numbers in a TCL wiki style table as

```  puts " %| testcase \$testcase_number | value| units |comment |%"
puts " &| volume| \$volume| cubic meters |based on length \$side1 and width \$side2   |&"  ```

## Snippet Pseudocode formula

```     #Pseudocode
weighted mean3 formula   =( norm1  +  norm2 ) / ( norm1 / rate1  + norm2 / rate2 )
set weighted_mean3 [ expr {(norm1+norm2)/((norm1/rate1)+(norm2/rate2)) }]
set weighted_mean3 [/ [+ norm1 norm2 ] [+ [/ norm1 rate1 ] [/ norm2 rate2 ]]]
set weighted_mean3 [/ [+ \$norm1 \$norm2 ] [+ [/ \$norm1 \$rate1 ] [/ \$norm2 \$rate2 ]]]
same result as ( delta quantity)  / (delta time)
set weighted_mean4 [ expr { ( \$norm2-\$norm1 )/(( \$norm1/\$rate1 )+( \$norm2/\$rate2 )) } ] ```