Simple and Compound Interest

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Important Maths Formulas of Simple Interest
Let Principal = P, Rate = R% per annum (p.a.) and Time = T years

 

Simple Interest(S.I.)

Simple Interest
Amount(A) A = P + S.I.
Principal  Principal
Rate  Rate
Time  Time

Important Maths Formulas of Compound Interest:
Let Principal = P, Rate = R% per annum (p.a.)  and Time = n years
Then, the amount A and compound Interest C.I. is:

When the interest is compounded yearly  Amount _ interest compounded yearly

Compound Interest_compounded yearly

When the interest is compounded half yearly  Amount _ interest compounded half yearly

Compound Interest_compounded half yearly

When the interest is compounded quarterly  Amount _ interest compounded quarterly

Compound Interest_compounded quarterly

When interest is compounded annually, but time is a fraction, say

Years in fraction

 

 Amount when time in fraction
When the rates are different for different years say, R1%, R2%, R3% per annum for first, second and third years, respectively  Amount when rates are different