A certain sum of money amounts to Rs 756 in two years and Rs 873 in 3.5 years. Find the the rate and sum of interest.
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Sol:
It is given that Principle + Simple Interest for 3.5 years = 873 Rs-----(1)
Principle + Simple Interest for 2 years = 756 Rs -------(2)
Subtracting (1) – (2) we get
Simple Interest for 1.5 years = 117 Rs.
Therefore, S.I = P x R xT .
Simple Interest for 2 years = Rs. 117/1.5 x2 =156 Rs.
Therefore P = 756 - 156 = 600 Rs
And rate of interest =100 x 156/600 x2 = 13% per annum.
Hope This Helps :)
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