Question
A certain sum of money amount to Rs. 1008 in 2 years and to Rs. 1164 in `3 1/2` years. Find the sum and the rate of interest .
Answer: Option A
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S.I. for `1 1/2` years = Rs. (1164 - 1008) = Rs. 156
S.I. for 2 years = Rs. `(156 xx 2/3 xx 2)` = Rs. 208
`:.` principal = Rs. (1008 - 208) = Rs. 800
Now , p. = 800, T = 2 and S.I. = 208
`:.` Rate = `((100 xx 208)/(800 xx 2))`% = 13%
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