The simple interest on a certain sum of money at the rate of 5% p.a. for 8 years is Tk. 840. At what rate of interest the same amount of interest can be received on the same sum after 5 years?

The simple interest on a certain sum of money at the rate of 5% p.a. for 8 years is Tk. 840. At what rate of interest the same amount of interest can be received on the same sum after 5 years? Correct Answer 8%

"প্রথম ক্ষেত্রে, 840  =  P  ×  8  ×  5100  [ ∵ I  =  pnr]  বা, P  =  840   ×  1008  ×   4  =  105  ×   20 ∴ P  =  2100 অর্থাৎ আসল 2100 টাকা দ্বিতীয় ক্ষেত্রে, 840 = 2100 × 5 × r ⇒ r  = 8402100  ×  5  ×  100%  =  8%
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