Question
Nidhi invested Rs. 2500 at R% S.I. and Rs. 7500 at (R +
3)% S.I. for 4 years. She paid a total interest of Rs. 4500. Find the rate on Rs. 7500.Solution
According to question, 2500 × R/100 × 4 + 7500 × (R + 3)/100 × 4 = 4500 100R + 300R + 300 × 3 = 4500 400R + 900 = 4500 400R = 3600 R = 9% So, R + 3 = 12%
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