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88
Section 7: Program Editing
Keystrokes
´b.1
´ •2
1
.
0
7
5
®
y
*
|n
Display
001-42,21,.1
002-42, 7, 2
0031
00448
0050
0067
0075
00834
00914
01020
01143 32
Interest.
(1 + i)n
PV (1 + i)n
Load the program and find the future value of $1,000 invested for 5
years; of $2,300 invested for 4 years. Remember to use G to run
a program with a digit label. (Answers: $1,435.63; $3,071.58.)
Alter the program to make the annual interest rate 8.0%.
Using the edited program, find the future value of $500 invested for
4 years; of $2,000 invested for 10 years. (Answers: $680.24;
$4,317.85.)
2.
Create a program to calculate the length of a chord ℓ subtended by an
angle  (in degrees) on a circle of radius r, according to the equation
θ
ℓ=2r sin .
2
Find ℓ when θ = 30° and r = 25.
(Answer: 12.9410. A possible program is: ´bA |D
´•4 2 * ® 2 ÷ [ * |n). (Assumes
 in Y-register and r in X-register when program is run.)