Question

at what rare of interest par annum will a sum double it self in 8 year​

Answer 1

Let principal = P, Then, S.I.= P and Time = 8 years

We know that S.I. = PTR/100

Rate = [(100 x P)/ (P x 8)]% = 12.5% per annum.

Answer 2

here is your answer ....plz go through it.