Suppose that you are thinking about buying a car and have narrowed down your choices to two options.

The new$-$car option: The new car costs $$30,000$ and can be financed with a three$-$year loan at $7\mathrm{.}91\%.$

The used$-$car option: A three$-$year old model of the same car costs $$18,000$ and can be financed with a three$-$year loan at $6\mathrm{.}56\%.$

What is the difference in monthly payments between financing the new car and financing the used car? Use $PMT=\frac{P(\frac{r}{n})}{[1-(1+\frac{r}{n}{)}^{-nt}]}.$

The difference in monthly payments between financing the new car and financing the used car is $ $.$

$($Round to the nearest cent as needed.$)$