Question
A certain amount triples in 10 years under simple
interest at a r% per annum. If Rs.12,000 is invested at (r + 2)% simple interest per annum, then find the interest earned after 5 years.Solution
Let the principal be Rs. 'P' Then, Simple Interest = 3P - P = Rs. 2P 2P = (P × r × 10) / 100 2 = (r × 10) / 100 r = 20 Now, new rate = (r + 2)% = 22% Simple Interest = {(12000 × 22 × 5) / 100} = Rs. 13,200
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