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A certain sum at simple interest amounts to Rs 1040 in 3 Yr and to Rs 1360 in 7 yr.Then the sum is?

Rs 750
Rs 800
Rs 900
Rs 1000

Correct Answer: Rs 800

Explanation:

Simple Interest for 4 yr = Rs(1360 - 1040 ) = Rs 320
so, Simple Interest for 3 yr= Rs [(320/4) x 3]= Rs 240
Sum = Rs (1040-240)= Rs 800

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