Answer: Option E -- 54.39years old
Explanation:
Compound interest is calculated using compound interest formula. Using compound interest formula, which is A = P(1+(r/n)) ^nt
Where A= Final Amount
P = Initial Principal Amount
r = Interest Rate
n = number of times interest applied per time period
t = number of times period elapsed
You/I would be 54.39years old when you/I retired. Which is Option E