(12C) [TAX -] [TAX+]

[Gamo]

Program to calculate tax inclusive or exclusive from giving price.

This program is similar to other 4 function calculator
That have [TAX-] and [TAX+] features.

Manual calculation is also fast and effective but this
Program help ease with less keystrokes to the results.
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Procedure: FIX 2

To Reset or Start Over: f. [PGRM] or [GTO] 00

Set Tax Rate Percent at Register 0 , [STO] 0

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Initialize with 0 or 1

0 for exclusive tax [TAX-]
1 for inclusive tax [TAX+]
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Example: f [PRGM]

For tax of 8%

8 [STO] 0 // store 8% tax

$54 include tax, What is the original price without tax?
$ 100 include tax, What is the original price without tax?

0 [R/S] display 0.00 // initialize for tax exclusive [TAX-]

54 [R/S] display -50.00 [X<>Y] 4.00

100 [R/S] display -92.59 [X<>Y] 7.41

Answer:
$54 without tax is $50 and tax amount is $4
$100 without tax is $92.59 and tax amount is $7.41

Remark: the final answer with negative sign indicate answer for exclusive tax
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Example: Inclusive Tax [TAX+]

f [PGRM]

1 [R/S] display 1 // initialize for tax inclusive [TAX+]

Use the same 8% tax from previous example

What is the price include tax of $45
What is the price include tax of $105

45 [R/S] display 48.60 [X<>Y] 3.60
105 [R/S] display 113.40 [X<>Y] 8.40
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Program:

Code:


01 X=0  // initialize 0 exclusive, 1 inclusive 
02 GTO 11  // it is initialize with 0 goto line 11
03 R/S  // wait for input for inclusive [Tax+]
04 ENTER
05 RCL 0
06  %
07  +
08 LSTx
09 X<>Y
10 GTO 03  // continue with [TAX+]
—————-
11 R/S  // wait for input for exclusive [TAX-]
12 ENTER
13  1
14 ENTER
15 RCL 0
16  %
17  +
18 X<>Y
19 LSTx
20 X<>Y
21  x
22 X<>Y
23 LSTx
24 Rv
25  ÷
26 X<>Y
27 Rv
28  -
29 LSTx
30 X<>Y
31 CHS  // “negative sign” indicate tax exclusive
32 GTO 11  // continue with [TAX-]

Gamo

[Gamo]

On HP-11C “Profit on Pricing Solver” can be use to

Calculate [TAX-] or [TAX+]

Example: USER mode

Tax Rate 8%

What is the original price without TAX for $54

Set TAX rate on [LBL] C

8 [C] display 0.00
54 [B] display 0.00
[A] display 50.00

Answer: $50 is the original price

To do the [TAX+]
Set Tax Rat at [C]
Original Price at [A]
Answer Price including TAX at [B]

Link to HP-11C “Profit on Pricing Solver”
https://www.hpmuseum.org/forum/thread-12947.html

Gamo