Question
A certain amount triples in 20 years under simple
interest at a r% per annum. If Rs.15,000 is invested at (r + 5)% simple interest per annum, then find the interest earned after 4 years.Solution
Let the principal be Rs. 'P' Then, Simple Interest = 3P - P = Rs. 2P 2P = (P × r × 20) / 100 2 = (r × 20) / 100 r = 10 Now, new rate = (r + 5)% = 15% Simple Interest = {(15000 × 15 × 4) / 100} = Rs. 9,000
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