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If Rs.64 amount to 83.20 in 2 years what will Rs.86 amount to in 4 years at the same rate percent per annum?
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Explanation:
let the rate of interest = R%
According to question
Intrest in 2 yrs = 83.20−64=19.20
R(in per)=SI×100\P×T
R(in per)=19.20×100\64×2
R(in per)=30\2=15%
Therefore, Amount of Rs.86 will be in four years by 15(in per) rate of interest
SI=86×15×4\100= Rs.51.6
Amount=Principal+S.I
=86+51.6=Rs. 137.60