Question
Rs. (n + 400) invested on simple interest amounts to Rs.
3,200 and Rs. 3,800 in 4 years and 6 years, respectively. Find the value of 'n'.Solution
Interest earned in 2 years = 3,800 - 3,200 = Rs. 600
Interest earned in 1 year = 600 ÷ 2 = Rs. 300
Interest earned in 4 years = 300 × 4 = Rs. 1,200
So, n + 400 = 3,200 - 1,200
Or, n + 400 = 2,000
Or, n = 1,600
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