A certain sum of money becomes 7000 in 6 years and Rs. 8240 in 10 years at any certain rate of simple interest. Find the principal amount.
Simple interest for 4 years = 8240 – 7000 = Rs. 1240 Simple interest for 1 year = 1240/4 = Rs. 310 Simple interest for 6 years = 310 × 6 = Rs. 1860 So, required principal amount = 7000 – 1860 = Rs. 5140
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