The simple interest on a sum for 3 years at 10% is Rs. 900. The compound interest on the same sum for 2 years at 10% is: MCQ with Answer and Explanation

Explanation:
Effective rate of compound interest for 2 years at 8% = 8 + 8 + (88)/100 = 16.64%. Simple interest rate = 8 * 2 = 16%. Given 16.64% of sum = 832 => 1% of sum = 50. Simple Interest = 16% of sum = 16 * 50 = Rs. 800.

Explanation:
Effective rate of compound interest for 2 years at 5% = 5 + 5 + (55)/100 = 10.25%. Given 10.25% of P = 246 => P = 246 / 0.1025 = Rs. 2400.

Explanation:
20000(1+r)² = 22050 ⇒ (1+r)² = 1.1025 = (1.05)² ⇒ r = 5%.