Question
A sum of Rs. 9,600 earns a simple interest of Rs. 1,920
in 2 years at a certain annual rate. What will be the simple interest on Rs. 12,000 for 4 years at the same rate?Solution
Let the rate of interest be 'R%' p.a. ATQ, 9600 × (R/100) × 2 = 1920 ⇒ R = 1920 ÷ 192 = 10 Now, required interest = 12000 × (10/100) × 4 = 12000 × 0.4 = Rs. 4,800
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