If 4 years' interest of Principal tk.500 and 5 years interest of Principal Tk. 600 are Tk. 500 in total , what is the rate of interest ?

If 4 years' interest of Principal tk.500 and 5 years interest of Principal Tk. 600 are Tk. 500 in total , what is the rate of interest ? Correct Answer 10%

এখানে, I1  + I 2  = 500 ⇒  n1p1r100 + n21p2r100 = 500 ⇒ 4×500×r100 = 5×600×r100  = 500⇒20r + 30r  = 500  ⇒r = 50050   ⇒ r  = 10  সুতরাং সুদের হার 10%
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