HP 10bii+ Margin/Markup bug

[Gamo]

Was looking in the HP-18C 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 HP-18C 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)

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I don't have the HP-18C so I'm not sure if start to store [PRICE] [M%P]
can it be solve for [COST] and [M%C]

Gamo