In this case, we'll have to carry out several steps to find the solution.
Step 01:
data:
principal = $22
rate = 2%
time = 40 years
Step 02:
simple interest:
annually
rate = 2% = 2 / 100 = 0.02
Amount:
A = P (1 + rt)
A = $22 (1 + 0.02 * 40)
A = $22 (1.8)
A = $39.6
The answer is:
total account balance = $39.6