$P(\frac{r}{n})$

Use $\frac{(n)}{[1-(1+\frac{r}{n}{)}^{-nt}]}$ to determine the regular payment amount, rounded to the nearest dollar. Consider the following pair of mortgage loan options for a $$150,000$ mortgage. Which mortgage loan has the larger total cost $($closing costs $+$ the amount paid for points $+$ total cost of interest$)?$ By how much?

Mortgage A: $15-$year fixed at $6\mathrm{.}25\%$ with closing costs of $$1700$ and $1$ point.

Mortgage B: $15-$year fixed at $4\mathrm{.}5\%$ with closing costs of $$1700$ and $4$ points.