The total cost of the car = $34395.66
Interest rate r = 4.2% = 4.2/100 = 0.042
Compounding frequency is monthly so r = 0.042/12 = 0.0035
Now number of years t = 4 years = 12 x 4 = 48 payments
And principal amount P = $34395.66
Now we can use the below formula to find the equal amount
PMT = [ p x r x (1+r)t ] / [(1+r)t-1]
PMT = [34395.66 x (0.0035) x (1+(0.0035)48 ] / [(1+(0.0035)48-1]
PMT = [120.3848 x (1.0035)48 ] / [(1.0035)48-1]
PMT = [120.3848 x (1.18258) ] / [1.18258-1]
PMT = [142.3646] / [0.18258]
PMT = 779.7381 ~ 779.74
So the monthly payment amount = $779.74
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