Posted by **sabina** on Monday, January 11, 2010 at 11:00am.

Jean purchased a $995 stereo system on the installment plan. She paid

20% down. The finance charge on the remainder was 19.4%. She was

given 18 months to pay off the balance. What was her monthly payment?

- math -
**drwls**, Monday, January 11, 2010 at 11:54am
The original unpaid balance was

P = 0.8 x 995 = $796.00

A finance charge of 19.4% is 19.4%/12 = i = 1.61667% per month. The number of payments is n = 18

The formula you need to use can be found at

http://en.wikipedia.org/wiki/Amortization_calculator

It is

A = P i /[1 - (1+i)^-n]

In your case,

A = 796*.0161667/[1 - 0.74929] = $51.32

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