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:

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:

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