Correct Answer: 12%
Explanation:
∵ [5000 x (1 +R/100)2 - 5000] - (5000 x 2 x R)/100 =72 ⇒ 5000[(1 +R/100)2 - 1 - R/50] = 72 ∴ 1 + R2/10000 + 2R/100 - 1 - R/5 = 72/5000 ⇒ R2 = (72/5000 x 10000) = 144 ∴ R = 12%