Hi,         

Note: formula for N(the number of months)to pay off the $1000 is as follows: 

N = −log(1−i*A/P) / log(1+i) where A = 1000, P = 20 and i = 12.96/12 = 1.08/mo

N = −log(1−(.0108)*1000/20) / log(1.0108)

N = −log(1−.54)/ log(1.0108)

N =  - log (.46) / log(1.0108) = -(-.7765)/.0107 = 72.57 months

After 72 months there will be a balance which can be determined by using:

B = A(1+i)^72 - P/i[(1+i)^72 - 1]

B = 1000(1.0108)^72 - 20/.0108[(1.0108)^72 - 1] 



 

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