Correct Answer & Explanation
Option D
• আমরা জানি, A = P(1 + r/100)ⁿ
এখানে, P = 4000, A = 4410, n = 2
4410 = 4000(1 + r/100)²
4410/4000 = (1 + r/100)²
441/400 = (1 + r/100)²
(21/20)² = (1 + r/100)²
1 + r/100 = 21/20
r/100 = 21/20 - 1 = 1/20
r = 100/20 = 5%
সুতরাং সুদের হার 5%।