(HP-65) Markup - % of price and % of cost
01-18-2020, 02:05 AM (This post was last modified: 01-18-2020 07:45 PM by Dave Britten.)
Post: #1
 Dave Britten Senior Member Posts: 1,374 Joined: Dec 2013
(HP-65) Markup - % of price and % of cost
This program solves the price-cost-markup equation for any variable, and using either markup as % of price or markup as % of cost.

Recommended Key Labels

A: P
B: C
C: MU%
D: %P
E: %C

If you wish to follow the Finance Pac labeling convention, draw a box around P, C, and MU%, to represent variables that can be solved for.

Usage

Keys A, B, and C represent the variables in the equation: price, cost, and markup % respectively. To store a value, enter it into x and press the matching key. To solve for a variable, press the matching key with 0 in the x register.

To select % of price or % of cost mode, press either D or E respectively. The calculation mode is controlled by flag 1, with % of price represented by flag 1 cleared (the default state).

Examples

If a store is purchasing a product for $38 and selling it for$50, what is the markup over cost?

E (set % of cost mode)
38 B
50 A
C: 31.58%

A company purchases a finished good for $27 wholesale. They would like to make at least 24% margin on the sale of this good. What should the minimum selling price be? D (set % of price/margin mode) 27 B 24 C A:$35.53

Code:
LBL     23 A       11 STO 1   33 01 0       00 g x!=y  35 21 RTN     24 g NOP   35 01 1       01 RCL 3   34 03 EEX     43 2       02 /       81 f-1     32 TF 1    61 CHS     42 g NOP   35 01 +       61 f-1     32 TF 1    61 g       35 1/x     04 RCL 2   34 02 *       71 STO 1   33 01 RTN     24 LBL     23 B       12 STO 2   33 02 0       00 g x!=y  35 21 RTN     24 g NOP   35 01 1       01 RCL 3   34 03 EEX     43 2       02 /       81 f-1     32 TF 1    61 CHS     42 g NOP   35 01 +       61 f       31 TF 1    61 g       35 1/x     04 RCL 1   34 01 *       71 STO 2   33 02 RTN     24 LBL     23 C       13 STO 3   33 03 0       00 g x!=y  35 21 RTN     24 g NOP   35 01 1       01 RCL 2   34 02 RCL 1   34 01 f       31 TF 1    61 g x><y  35 07 g NOP   35 01 /       81 f       31 TF 1    61 g x><y  35 07 g NOP   35 01 -       51 EEX     43 2       02 *       71 STO 3   33 03 RTN     24 LBL     23 D       14 f-1     32 SF 1    51 RTN     24 LBL     23 E       15 f       31 SF 1    51 RTN     24
01-18-2020, 06:41 AM
Post: #2
 Gamo Senior Member Posts: 565 Joined: Dec 2016
RE: (HP-65) Markup - % of price and % of cost
Finally someone here interested about Markup% and Margin%
I called this Business Percent as " Profit on Pricing " calculations.

I have program this on serveral HP RPN programmable calculator here.

HP-12C

HP-11C

HP-41C

HP-67

Your program algorithm is very interesting compared to my version.

Gamo
01-18-2020, 02:11 PM
Post: #3
 Dave Britten Senior Member Posts: 1,374 Joined: Dec 2013
RE: (HP-65) Markup - % of price and % of cost
You have to get creative when you only have 100 steps, and things like LBL, GTO, and 1/x take 2 of them.

I was trying to come up with a way to have all four variables without the manual mode switch, but I don't think it can be done elegantly in the space available.
01-18-2020, 07:27 PM
Post: #4
 DaveBr Junior Member Posts: 33 Joined: Jun 2018
RE: (HP-65) Markup - % of price and % of cost
In line #11, the shouldn’t the key code be 81 instead of 61?

/ =81
+ = 61

Dave

RPN rules!
01-18-2020, 07:44 PM
Post: #5
 Dave Britten Senior Member Posts: 1,374 Joined: Dec 2013
RE: (HP-65) Markup - % of price and % of cost
(01-18-2020 07:27 PM)DaveBr Wrote:  In line #11, the shouldn’t the key code be 81 instead of 61?

/ =81
+ = 61

Dave

You are correct, thanks. I was transcribing this rather late at night.
01-19-2020, 09:08 AM
Post: #6
 Gamo Senior Member Posts: 565 Joined: Dec 2016
RE: (HP-65) Markup - % of price and % of cost
Pricing on Profit program for HP-12C took only 60 program steps.

Gamo
01-19-2020, 01:08 PM
Post: #7
 Dave Britten Senior Member Posts: 1,374 Joined: Dec 2013
RE: (HP-65) Markup - % of price and % of cost
(01-19-2020 09:08 AM)Gamo Wrote:  Pricing on Profit program for HP-12C took only 60 program steps.

Gamo

Interesting. I'll have to give it a closer look, but that might fit on the 65. However, any GTO would become 2 steps and require a matching LBL - which would also be 2 steps - the 65 doesn't have built-in percent functions, so those would become more steps, and functions like 1/x are unmerged and take two steps (one for the shift key).
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