Question
Rohit borrowed Rs. 6000 at R% S.I. and Rs. 4000 at (R +
5)% S.I. for 2 years. If the total interest was Rs. 2000, find the rate on Rs. 4000.Solution
6000 × R/100 × 2 + 4000 × (R + 5)/100 × 2 = 2000 120R + 80R + 80 × 5 = 2000 200R + 400 = 2000 200R = 1600 R = 8% So, R + 5 = 13%
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