Question

Rs 2000 are invested at 5% p.a simple interest. If the interest is added to the principal after every 10 years, the amount will become Rs 4000 after

A 15 years Correct Answer Incorrect Answer
B 20 years Correct Answer Incorrect Answer
C 16(2/3)years Correct Answer Incorrect Answer
D 6(2/3)years Correct Answer Incorrect Answer

Solution

S.I for 10 years = (2,000 × 5 ×10)/100 = Rs 1,000 Principal after 10 years becomes = Rs (2,000 + 1,000) = Rs 3,000 S.I on it = Rs 4,000 – 3,000 = Rs 1,000 Time = (100 × 1000)/(5 × 3000)= 6*2/3years Total time = 10 + 6 2/3years = 16*2/3years

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