The difference between the compound interest and the simple interest on a sum for 3 years at 10% per annum is ₹93. What is the sum?
A. ₹3300
B. ₹2900
C. ₹3000
D. ₹3100
A. ₹3300
B. ₹2900
C. ₹3000
D. ₹3100
Best answer
Answer: C. ₹3000
Answer: (C) ₹3000
Shortcut: for 3 years, CI − SI = \(P\left(\frac{R}{100}\right)^2\left(3 + \frac{R}{100}\right) = P \times 0.01 \times 3.1 = 0.031P\).
0.031P = 93, so P = ₹3000.
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