Your credit card charges $18\%$ APR and your current balance is $$7,500.$ Calculate the following amounts. Round your answers to two decimal places.

A$)$ If you want to pay off the credit card in $4$ years, how much will you need to pay each month, assuming you don't charge anything new to the card?

$

each month

B$)$ How much total interest do you pay?

$

total interest