Compound Interest Important Formulas:

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Compound Interest Important Formulas:
1. Let Principal = P, Rate = R% per annum, Time = n years.

2. When interest is compound Annually:

Amount = P (1 +R/100)n
3.When interest is compounded Half-yearly:

Amount =P (1 +(R/2)/100)2n
4.When interest is compounded Quarterly:

Amount =P (1 +(R/4)/100)4n
5.When interest is compounded Annually but time is in fraction, say 3 years.

Amount = P (1 +R/100)3 x [1 +(2/5 R)/100)]
6.When Rates are different for different years, say R1%, R2%, R3% for 1st, 2nd and 3rd year respectively.
Then,

Amount = P (1 +R1 /100 )(1 +R2 /100 )(1 +R3 /100 )
7.Present worth of Rs. x due n years hence is given by:

Present Worth = x /(1 + R/100 )
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