Question
A certain amount doubles in 4 years under simple
interest at a r% per annum. If Rs.10,000 is invested at (r + 5)% simple interest per annum, then find the interest earned after 2 years.Solution
Let the principal be Rs. 'P' Then, Simple Interest = 2P - P = Rs. P P = (P × r × 4) / 100 1 = (r × 4) / 100 r = 25 Now, new rate = (r + 5)% = 30% Simple Interest = {(10000 × 30 × 2) / 100} = Rs. 6,000
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