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?
Keystrokes Display
1 |
|
|
| 1.00 |
|
|
|
|
|
| |
| 1 |
|
|
|
|
48 |
|
| 1 | 1.00 |
|
|
|
|
|
| |
|
|
|
|
|
|
5 |
| 1 |
| 1.00 |
|
|
|
|
|
| |
|
|
|
|
|
|
1.45 |
|
|
| 0.49 |
|
|
|
|
|
| |
3.28 | 1 |
|
|
|
|
| 100 |
|
| 10.51 | 3rd discount rate (%). |
|
|
|
|
|
The following program for the HP 12C will be helpful in performing the calculations:
KEYSTROKES |
| DISPLAY |
|
|
|
CLEAR | 00- |
|
1 | 01- | 1 |
| 02- | 34 |
|
|
|
| 03- | 25 |
|
|
|
96
