Use PMT $=\frac{P(\frac{r}{n})}{[1-(1+\frac{r}{n}{)}^{-nt}]}$ to determine the regular payment amount, rounded to the nearest dollar. Your credit card has a balance of $$5800$ and an annual interest rate of $12\%.$ You decide to pay off the balance over four years. If there are no further purchases charged to the card,

a$.$ How much must you pay each month?

b$.$ How much total interest will you pay?

a$.$ The monthly payments are approximately $

$($Do not round until the final answer. Then round to the nearest dollar as needed.$)$

b$.$ The total interest paid over $4$ years is approximately $

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