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What is the rate of simple interest for the first 4 years if the sum of TK. 360 becomes TK. 540 in 9 years and the rate of interest for the last 5 years is 6% ?

What is the rate of simple interest for the first 4 years if the sum of TK. 360 becomes TK. 540 in 9 years and the rate of interest for the last 5 years is 6% ? Correct Answer 5%

Original sum = Tk. 360 Total interest in 9 years = 540 - 360 = 180 Interest in last 5 years = 5 x 6 = 30% = 30/100 x 360 = Tk. 108 = > Interest in first four years : 180 - 108 = Tk. 72 Interest per annum = 72/4 = 18 Rate of interest for first four years = 18/360 x 100 = 5%

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