HP -11C Owner's Handbook Manual page 22

Storage Register Arithmetic Exercises
Keystrokes Display
18[STO}O 18.0000 Stores 18 in Ro.
3 (sto)EJo
3.0000
Divides number
in Ro(18)
by 3.
RCLJO 6.0000 Recalls copy of new
number in Ro.
4(STO)[kJO 4.0000 Multiplies new number in
Ro (6.0000) by 4.
RCLJO 24.0000 Recalls copy of new
number in Ro.
24.0000 Adds 24 to number in Ro.
48.0000 Recalls copy of new
number in Ro.
40(STo)EJo
40.0000
Subtracts 40 from number
in Ro.
RCLJO 8.0000 Recalls copy of new
number in Ro.
Problems
1. Calculate the value of x in the following equation.
Rc ~5.2) = (8.33 — 7.46) X 0.32)
x=
4.3(3.15 — 2.75) — (1.71 X 2.01)
Answer: 4.5728
A possible keystroke solution is:
4 (ENTER)5.25)
8.33 Fe] 77.46
=).32 bd)
3.15 (ENTER)2.75 C)
4.36)1.71
2.01 JERS
2. Use constant arithmetic to calculate the remaining balance
of a $1000 loan after six payments of $100 each and an
interest rate of 1% per payment period.
~~~
wee wv
Section 2: Memory Stack, LAST X, and Data Storage 41
Procedure: Load the stack with (1 + i) and key in the initial
loan balance. Use the following formula to find the new
balance after each payment:
New Balance = ((O]d Balance) x (1 +7)) — Payment
Answer: 446.3186
Store 100 in Rs. Then:
1. Divide the contents of R; by 25.
2. Subtract 2 from the contents of Rs.
3. Multiply the contents of R; by 0.75.
4. Add 1.75 to the contents of R;.
5. Recall the contents of R;.
Answer: 3.2500.