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Compound Interest - ( Arithmetic Aptitude)

  1. Let Principal = P, Rate = R% per annum, Time =nyears.
  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 3years.
    Amount = P 1 + R 3 x 1 + R
    100 100
  6. When Rates are different for different years, say R1%, R2%, R3% for 1st, 2ndand 3rdyear respectively.
    Then, Amount = P 1 + R1 1 + R2 1 + R3 .
    100 100 100
  7. Present worth of Rs.xduenyears hence is given by:
    Present Worth = x
    1 + R n
    100