Calculation of monthly interest rate:
Amount
borrowed = $20,000
Monthly payment = $483.58
Time period = 4 years or 48 months
Let monthly interest rate be i%
$20,000 = $483.58 * PVIFA(i%, 48)
Using
financial calculator:
N = 48
PV = -20000
PMT = 483.58
FV = 0
I = 0.625%
Monthly interest rate = 0.625%
Calculation of loan outstanding:
Period outstanding = 30 months
Loan
outstanding = $483.58/1.00625 + $483.58/1.00625^2 + … +
$483.58/1.00625^29 + $483.58/1.00625^30
Loan outstanding = $483.58 * (1 - (1/1.00625)^30) / 0.00625
Loan outstanding = $483.58 * 27.277919
Loan outstanding = $13,191.06
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