Staff Selection Commission Quantitative Aptitude — Question 65

Question

A sum of money doubles itself in 8 years at simple interest. What is the rate of interest?

1. 10
2. 12.5
3. 15
4. 20

Correct answer

B — 12.5

Explanation (English)

SI = P, so P = PRT/100, 100 = 8xR, R = 12.5%

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