HP 10bii+ Margin/Markup bug

[Gamo]

The HP-37E 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.

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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.
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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 X-registers 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.
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Gamo