A Sum of money at simple interest amount to Rs. 815 in 3 years and to Rs. 854 in 4 years. Find the principal amount.

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Solution

S.I. for 1 year = Rs (854 - 815) = Rs. 39.
S.I. for 3 years = Rs (39 × 3) = Rs. 117.
$∴$ Principal = Rs. (815 - 117) = Rs 698.

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