Final answer:
To provide $60,000 on each birthday from the 18th to the 21st, an end-of-quarter deposit of approximately $14,297.37 must be made.
Step-by-step explanation:
To calculate the end-of-quarter deposit that must be made to provide $60,000 on each of the son's birthdays from the 18th to the 21st, we can use the formula for compound interest:
A = P(1+r/n)^(nt)
Where:
A = future value ($60,000)
P = principal deposit (unknown)
r = annual interest rate (6% or 0.06)
n = number of compounding periods per year (4)
t = number of years (from the 3rd birthday to the 21st birthday, which is 18 years)
Let's solve for P:
$60,000 = P(1+0.06/4)^(4*18)
$60,000 = P(1.015)^72
$60,000/(1.015)^72 = P
P ≈ $14,297.37
The end-of-quarter deposit that must be made is approximately $14,297.37.