Answer:
11%
Explanation:
Compounding is the method used to determine the future worth of an amount today while discounting is the method used to determine the present value of a future amount.
Both are related by
Fv = Pv(1 + r)^n
where Fv is the future amount
Pv is the present value
r = rate
n = time
As such,
18.5 = 15 (1 + r)^2
1.2333 = (1 + r)^2
1 + r = 1.11
r = 0.11
the annual percent on returns is 11%
