Question

a sum compound annually becomes 25/16 times of itself in 2 yrs. then, the rate of interest per annum is ??
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Answer 1

hey.. here's ur solution
let sum = Rs x and rate = R% per annum

then,
amount = (25/ 16 )x

therefore ,

(25/ 16) x = x ( 1+ R/100)²


( 5/4 )² = ( 1+ R/100)²

on comparing, we get

➡5/4 = ( 1+ R /100 )

➡R / 100. = 1/ 4

therefore,

➡R = 25%
❇ hope it might be helpful !! ❇

Answer 2

solution is here in picture.