In how many years, Tk. 150 will produce the same interest @8% Tk.800 produce in years @4.5% ?

In how many years, Tk. 150 will produce the same interest @8% Tk.800 produce in years @4.5% ? Correct Answer 9

In second stage, 100 taka in 1 year gains 41/2 or 9/2 taka 1 taka in 1 year gains 9 /(2×100) taka 800 taka in 3 year gains = ( 9×3×800)/200 = 108 tk In first stage, 100 taka gains 8 taka 1 taka gains 8/100 taka 150 taka gains (8×150)/100 taka = 12 taka Now, 12 tk is gained in 1 year 108 tk is gained in = 108/12 = 9 years
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