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list and new and several discounts are known it may be desirable to calculate
a missing discount. The following series of keystrokes may be used:
1. Key in 1, press 1.
2. Key in the first discount (as a percentage) and press 1
.
3. Repeat step 2 for each of the remaining known discount rates.
4. To calculate the list price, key in the net price and press 1 .
5. To calculate the net price, key in the list price and press 1 .
6. To calculate an unknown discount rate, immediately after doing step 3
(display should show 1.00), key in the net price, press and key
in the list price.
7. Press 1 100 .
Example: The list price of an item is $3.28 and the net price is $1.45. Two
of the discount rates are 48% and 5%. What is the third discount rate?
The following program for the HP 12C will be helpful in performing the
calculations:
Keystrokes Display
1
1
1.00
48 1
1.00
5 1
1.00
1.45
3.28 1
0.49
100
10.51 3rd discount rate (%).
KEYSTROKES DISPLAY
CLEAR
00-
1 01- 1
02- 34
03- 25