Simple interest Notes

In all competitive exams questios on simple intrest ar common.now we will see simpl interest. When we will go to a bank manager and we will asked a loan of Rs.100/-. He will say that” the rate of interest is 12% per anum”. What is the rate of interest? When we are taking Rs.100/- from a bank at 12% rate of interest mean’s after one year we need to pay Rs.12/- extra along with Rs.100/-.

                The following table shows the interest payable at every year end.

Time to double the principla amount:if we are taken Rs.100/- then time taken to double the amount at 10% interest is 10 years. The interest becomes Rs.100/- equal to principal. So amount=principal+interest=100+100=200/-.Means in 10 years principal =Rs.100/- & amount=Rs.200/- means Rs.100 is getting double in 10 years at a !0% rate of interest.