Question

In what time rs.800 amount to rs.882 at rs.5% per annum compounded annually

Answer 1

A = p(1+r/100)^n
or 882=800(1+5/100)^n
or 882/800=(21/20)^n
or 441/400=(21/20)^n
or (21/20)^2=(21/20)^n
=> n=2

Answer 2

P= 800

A= 882

r = 5%

A = p(1+r/100)^n

or 882=800(1+5/100)^n

or 882/800=(21/20)^n

or 441/400=(21/20)^n

or (21/20)^2=(21/20)^n

=> n=2