Arithmatical - Compound Interest

Important Facts and Formulae
1. Let Principal = P, Rate = R% per annum, Time = n years.
2. When interest is compound Annually:
  Amount = P 1 + R n
100
3. When interest is compounded Half-yearly:
  Amount = P 1 + (R/2) 2n
100

4. When interest is compounded Quarterly:
  Amount = P 1 + (R/4) 4n
100
5. When interest is compounded Annually but time is in fraction, say 3x2/5 years
  Amount = P 1 + R 3
100
x 1 + 2/5 x R  
100
6. Present worth of Rs. x due n years hence is given by:
  Present Worth = x / 1 + R n
100