IBPS , SSC - 2015: Difference between Compound Interest and Simple interest

Difference between Compound Interest and Simple interest

1. If time is 1 Year ,then Simple Interest=Compound Interest

2. If time is 2 Year then 
Compound Interest-Simple Interest or 
Difference = P(R/100)^2

3. If time is 3 Year then, 
Compound Interest-Simple Interest or 
Difference = P(R/100)^2(300+r/100)

Note: - Here P=Principle
                     R=Rate of Interest
                     T=Time