ATQ, Difference between interests earned on investing Rs. 'p' each on simple interest at 'r'% p.a. and compound interest at 'r'% p.a. compounded annually for 2 years = p × (r2/10,000) So, 24,000 × (r2 /10,000) = 777.6 Or, (r2 /10,000) = (777.6/24,000) Or, (r2 /10,000) = 0.0324 Or, r2 = 324 So, 'r' = 18 Since, 't' can't be negative, so 'r' = 18% Simple interest = Principal × rate × time ÷ 100 Therefore, required interest = 24,000 × 18 × 2 ÷ 100 = Rs. 8,640
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