Question

In how many years rs.750amounts to rs.900at 4%per annum?

Answer 1

we have amt..=750,rate=4%, principal=900time=?,and SI=?
=amt..=SI + pri...
=750=SI+900
=SI=900-750
=SI=150
=SI=p×r×t/100
=150=900×4×t/100
=t=240

Answer 2

the interest is 900-750=150
So by using the formula 
I=(P.R.T)/100
15000=750.4.T
15000=3000.T
T=5 years