Question

A certain sum, invested with interest of 8% per annum, compounded semi-annually amounts to Rs. 6760 at the end of 1 year. The sum is -

Answer 1

as we know that, 
amount= P (1+ R/200)^(n×2) ,
since, it is compounded semi annually so, rate is R/2 and n =T×2
⇒6760=P (1+8/200)²
⇒6760= P( 26/25)²
⇒P =6250
so the sum is Rs 6250