A sum at compound interest becomes Rs. 800 in 3 years and Rs. 840 in 4 years. Find rate. A. 2.5% B. 4% C. 5% D. 6⅔% Explanation: Annual growth rate derived.
A sum at compound interest becomes Rs. 2420 in 2 years and Rs. 2662 in 3 years. Find rate. A. 15% B. 10% C. 7.5% D. 8% Explanation: The ratio of amounts gives the rate.
A sum becomes Rs. 6690 in 3 years and Rs. 10035 in 6 years. Find principal. A. Rs. 4400 B. Rs. 4445 C. Rs. 4460 D. Rs. 4520 Explanation: Linear increase gives principal.
A sum becomes 7/5 of itself in 4 years. Find the rate of interest. A. 9% B. 10% C. 11% D. 12% Explanation: Increase = 40% in 4 years ⇒ 10% yearly.
A sum at simple interest amounts to Rs. 815 in 3 years. What is principal? A. Rs. 700 B. Rs. 690 C. Rs. 650 D. Rs. 698 Explanation: Reverse SI formula.
A sum becomes Rs. 10648 in 3 years and Rs. 9680 in 2 years. Find rate. A. 5% B. 10% C. 15% D. 20% Explanation: Interest per year calculation.
A sum becomes Rs. 9800 in 5 years and Rs. 12005 in 8 years. Find the rate of simple interest. A. 5% B. 8% C. 12% D. 15% Explanation: A difference over time gives a rate.
A sum amounts to Rs. 2916 in 2 years and Rs. 3149.28 in 3 years at compound interest. Find principal. A. Rs. 1500 B. Rs. 2000 C. Rs. 2500 D. Rs. 3000 Explanation: Use the ratio of consecutive amounts.
A sum amounts to Rs. 1344 in 2 years at simple interest. What is principal? A. Rs. 150 B. Rs. 140 C. Rs. 130 D. Data insufficient Explanation: Rate not given, cannot determine.
A student scored an average of 80 marks in 3 subjects. What are the total marks? A. 60 B. 64 C. 72 D. 80 Explanation: Total = average × number of subjects.