Rs.1,000 is invested at 5% per annum simple interest. If the interest is added t

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Rs.1,000 is invested at 5% per annum simple interest. If the interest is added to the principal after every 10 years, the amount will become Rs.2,000 after

Options:

A . 18 years

B . 15 years

C . 16$2/3$ years

D . 20 years

Answer: Option C
Answer: (c)Using Rule 1,After 10 years,SI = ${1000 × 5 × 10}/100$ = Rs.500Principal for 11th year= 1000 + 500 = Rs.1500SI = Rs.(2000 - 1500) = Rs.500T = ${SI × 100}/{P × R} = {500 × 100}/{1500 × 5}$= $20/3$ years = 6$2/3$ yearsTotal time = 10 + 6$2/3$= 16$2/3$ years

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