Question
What is the rate of interest % per annum? I. The
difference between the compound interest and the simple interest on an amount Rs 20,000 in two years is Rs 220.50. II. The amount doubles itself at simple interest in 7.5 years. III. The compound interest accrued in 5 years is more than the principal.Solution
R² = (D × 100²)/P = (220.5 × 10,000)/20000 ∴ R² = √110.25 = 10.5% From II S.I = (P ×R × T)/100 R = (100 × P)/(P × R × 15/2) R = 40/3 years Hence, either statement I or II is sufficient to answer the question.
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