What sum of money will amount to Rs. 520 in 5 years and to Rs. 568 in 7 years at simple interest?
A. Rs. 400
B. Rs. 120
C. Rs. 510
D. Rs. 220
Answer: Option A
Solution(By Examveda Team)
(Principal + Interest) in 5 years → 520(Principal + Interest) in 7 years → 568
$$\eqalign{ & \therefore {\text{Interest in 2 years = 48}} \cr & \therefore {\text{I = }}\frac{{{\text{48}}}}{2}{\text{ }} \cr & \,\,\,\,\,\,\,\,\,{\text{ = Rs}}{\text{. 24 in one year}} \cr & \therefore {\text{P = 520 - 24}} \times {\text{5}} \cr & \,\,\,\,\,\,\,\,\,\,{\text{ = Rs}}{\text{. 400}} \cr} $$
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