HP-22 1706A12167 in search of advice

[james summers]

Ciao Alberto (and Edoardo)

Congratulations on your HP22, a model I would like to get!

I can't help with the post you mention but pages 88 and 89 of the July 1987 HP12C Solutions Handbook (see literature.hpcalc.org) may help as it gives the keystrokes for calculating the various relations between markup, margin, selling price and cost.

For example:

• to calculate markup given cost and selling price, key in cost, press [enter] key in selling price and press [Δ%]
  

The HP12C Owners Handbook and Problem-Solving Guide says that the Δ% key can be used for calculations of the percent difference between a wholesale cost and a retail cost. If the base number entered is the wholesale cost, the percent difference is called the markup; if the base number entered is the retail cost, the percent difference is called the margin.

Hence the next examples from the Solutions Handbook:

• to calculate markup given margin, key in margin, press [enter] [enter] [1] [x><y] [%] [-] [÷]
• to calculate margin given selling price and cost, key in selling price, press [enter] key in cost and press [Δ%] [CHS]
• to calculate margin given markup, key in markup, press [enter] [enter] [1] [x><y] [%] [+] [÷]
  

I hope this helps.

Good luck with the display.