HP 10bii+ Margin/Markup bug

03302021, 05:00 PM
(This post was last modified: 03312021 10:51 PM by Rick314.)
Post: #21




RE: HP 10bii+ Margin/Markup bug
I have a 17BII too, and found other issues with how these subjects are implemented on various HP calculators. For example:
Code: HP 17BII HP 200LX, HP CALC, Bus% HP 10BII+ The 17BII "OLD NEW %CH" and "COST PRICE M%C" are the same math with different variable names. The 200LX "OLD NEW %CHG" and "COST PRICE MARKUP" are the same math with different variable names. The 200LX Solver has function L() (Let variable equal expression, needed for my Solver function earlier in this thread) but the 17bII is missing it. The 17BII "M%C" ("MARKUP%C" when solved) and "M%P" ("MARKUP%P" when solved) should be PROFIT (price  cost) as a percentage of Cost or Price, not MARKUP as a percentage of Cost or Price. The wrong word is used. The 10bII+ MAR key can mean either MARkup or MARgin, a confusing choice of a key legend. The 200LX variable order (COST PRICE MARKUP MARGIN) seems more logical than the 10bII+ (MarkUp CoST PRiCe MARgin). 3/31/21 Edit: REVENUE changed to PROFIT (error correction). 

04012021, 12:55 PM
(This post was last modified: 04012021 12:56 PM by Gamo.)
Post: #22




RE: HP 10bii+ Margin/Markup bug
Was looking in the HP18C Business Consultant Owner's Manual
On page 53 about Sharing Variables Between Menus If you compare the MU%C menu and the MU%P menu, you'll see that they have two menu lables in common are [COST] and [PRICE]: The HP18C keeps track of the values you key in according to those labels. Example: Using shared variables. Part 1. Cost = 9.60 Markup = 15% What is the Price? Part 2. What is the markup on price (Margin)? [BUS] [MU%C] // Display the MU%C menu. 9.60 [COST] // Store 9.60 in COST. 15 [M%C] // Store 15% in M%C (Markup) [PRICE] 11.04 // Calculate the PRICE Part 2. [EXIT] [MU%P] // Exit the MU%C menu and enter the MU%P menu [M%P] 13.04 // Calculate the markup as a percent of price (Margin)  I don't have the HP18C so I'm not sure if start to store [PRICE] [M%P] can it be solve for [COST] and [M%C] Gamo 

04012021, 04:38 PM
(This post was last modified: 04012021 08:38 PM by Rick314.)
Post: #23




RE: HP 10bii+ Margin/Markup bug
(04012021 12:55 PM)Gamo Wrote: ... HP18C Business Consultant ...Thank you Gamo, but this is the same as the 17BII and demonstrates the same problem that started this thread. It can't solve all 12 mathematically possible inputoutput scenarios without doing a required entrysolve sequence ("Part 1", "Part 2") and finding intermediate values that are sometimes unnecessary. The HP 200LX HP CALC Solver solution given 3/27/21 converts from 15% Markup to 13.04% Margin directly (no need for Cost or Price at all), or any other mathematically possible fromto situation: Enter Markup and Cost, Solve for Price (and you get Margin too); Enter Markup and Cost, Solve for Margin (and you get Price too); ... 12 scenarios total. All HP calculators could have done this, but none do so. 

04082021, 07:01 AM
(This post was last modified: 04082021 07:35 AM by Gamo.)
Post: #24




RE: HP 10bii+ Margin/Markup bug
The HP37E Financial Calculator I believe that this is the only HP calculator that
can calculate between Mark Up and Margin by the use of the [PRICE] function. If you have the 37E User's Handbook this [PRICE] feature on page 10 This user manual never memtion the term call " Margin " instead it called Markup based on selling price.  Example from manual: Harry's Bait and Tackle Shop can purchase crab pots for $5.60. If Harry desires to maintain a markup of 60% based on the selling price, how much is the selling price? 60 [ENTER] display 60.00 // Enter markup then cost. 5.6 [f] [PRICE display 14.00 // Selling price. So the 60% is the "Margin" and 5.6 is the "Cost" The formula for PRICE is X ÷ [1  (Y ÷ 100) ] where x is the purchase cost and y is markup based on selling price.  On page 11 shown how to convert beween Mark Up and Margin As state in the manual: You many want to convert the percent of markup from a selling cost base to a purchase cost base or vice versa. You can do this with the [PRICE] key. Let's look at two examples. 1. If an item is sold at a 30% markup based on selling price, what is the equivalent markup based on cost? 30 [ENTER] display 30.00 // % markup based on selling price. [f][PRICE] display 42.36 // % markup based on purchase cost. 2. If an item is sold at a 70% markup based on the purchase cost, what is the equivalent markup based on sellin price? 70 [CHS] [ENTER] display 70.00 // Change sign of markup based on cost and [ENTER] [CHS] dispaly 70.00 // Now the Y and Xregisters have the correct values for the calculation [f] [PRICE] display 41.18 // % markup based of selling price. Remark: Example #2 basically is to convert Markup to Margin so in order to use Markup the value must enter as negative by [CHS] key.  Gamo 

04102021, 06:26 PM
Post: #25




RE: HP 10bii+ Margin/Markup bug
Thank you for the interesting HP37E information Gamo. It shows another way HP handled the Price, Cost, Markup, Margin problem, but still not covering all possible inputsolve combinations. The HP 200LX HP CALC solution given in this thread 3/27/21 handles all 12 possible cases:
Code: Inputs Solve For 

04112021, 02:54 AM
(This post was last modified: 04112021 03:43 AM by Gamo.)
Post: #26




RE: HP 10bii+ Margin/Markup bug
Sorry for this one cause is not HP related.
I program this Pricing Calculations using the Python code. This code can be run and view the code on the web. So that one who really interest can see the algorithm I used for this program. Link: https://trinket.io/python/656c020f51?runOption=run For choice Program #1 Enter the two unknown with 0 If enter 0 on both Cost and Price one of the Markup and Margin must Have a value so this can be converted between MU and MAR Gamo 

04222021, 07:10 AM
Post: #27




RE: HP 10bii+ Margin/Markup bug  
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