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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:

^{n}

**3**.When interest is compounded Half-yearly:

^{2n}

**4**.When interest is compounded Quarterly:

^{4n}

**5**.When interest is compounded Annually but time is in fraction, say 3 years.

^{3}x [1 +(2/5 R)/100)]

**6**.When Rates are different for different years, say R

_{1}%, R

_{2}%, R

_{3}% for 1st, 2nd and 3rd year respectively.

Then,

_{1}/100 )(1 +R

_{2}/100 )(1 +R

_{3}/100 )

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

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