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The total amount of principal and interest

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If the principal is a, and the annual rate of interest is r, the total amount of principal and interest is sequentially...

W0 = a
W1 = a+a*r = a(1+r)
W2 = {a(1+r)+a(1+r)r}=a(1+r)(1+r)=a(1+r)^2
W3 = {a(1+r)^2 + a(1+r)^2 r} = a(1+r)^3
 .
 .

Then, the total amount after n year is Wn = a(1+r)^(n) and amount of interest is Wn-a.

If the unit of interest rate is %, Wn = a (1 + r/100) ^ (n).


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Wn = a (1 + r/100) ^ (n)
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