This isn't really a problem computational theory. But I will complete this anyway.
Define x to be the monthly payment. r to be the monthly interest rate, T be the number of months.
Total future value of these payment is
T−1∑i=0x(1+r)i=x(1+r)n−1(1+r−1)=x(1+r)n−1r
But then it must equals to the future value of the loan, so we have
x(1+r)n−1r=p(1+r)n
Plugging in the values it is easy to see the answer is $536.82.
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