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Compound Interest Formulas

  1. Let Principal = P, Rate = R% per annum, Time = n years.
  2. When interest is compound Annually:
       Amount = P1 +Rn
    100
  3. When interest is compounded Half-yearly:
        Amount = P1 +(R/2)2n
    100
  4. When interest is compounded Quarterly:
        Amount = P1 +(R/4)4n
    100
  5. When interest is compounded Annually but time is in fraction, say 3 years.
        Amount = P1 +R3x1 +R
    100100
  6. When Rates are different for different years, say R1%, R2%, R3% for 1st, 2nd and 3rd year respectively.
        Then, Amount = P1 +R11 +R21 +R3.
    100100100
  7. Present worth of Rs. x due n years hence is given by:
        Present Worth =x.
    1 +R
    100

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