Depends on which year it is.

1980  interest rates were approx. 16%  and  the cost per month was  $9,413

I990   interest rates were approx. 10%  and  the cost per month was  $,6143

2000  interest rates were approx .   8% and  the cost per month was  $5.136

2006  interest rates were  approx.    7% and  the cost per month was  $4,657

Today interest rates are 5.25 % and the cost per month is $3,811!!