Compound Interest Formulas, Tricks and Questions and Answers

Compound Interest Formulas

1. Let Principal = P, Rate = R% per annum, Time = n years.

2. When interest is compound Annually:

3. When interest is compounded Half-yearly:

4. When interest is compounded Quarterly:

5. When interest is compounded Annually but time is in fraction, say $3 \frac { 2 } { 5 }$ years.
$Interest is compounded for Mixed fractions$

6. When Rates are different for different years, say R₁%, R₂%, R₃% for 1^st, 2^nd and 3^rd year respectively.

7. Present worth of Rs. x due n years hence is given by: