Question
A sum of money becomes Rs. 9600 in 3 years and Rs. 11200
in 7 years at simple interest. Find the principal.Solution
ATQ, Increase in amount from 3 years to 7 years = 11200 - 9600 = 1600 This is interest for 4 years. So, 1 year's interest = 1600/4 = 400 Interest for 3 years = 3 × 400 = 1200 Principal = 9600 - 1200 = 8400 Hence, the correct answer is Rs.8400.
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