$($Q$6$b$)$ Brian has a very low credit score and has to pay the highest interest rate. He is not able to pay off his balance each month, so he pays interest. Calculate how much interest he would pay in a year if he maintained an average balance of $$5,000$ each month. Enter your answer rounded to two decimal places.

$\backslash$table$[[\backslash$table$[[$Annual Percentage$],[$Rate $($APR$)$ for$],[$Purchases$]],\backslash$table$[[0\mathrm{.}00\%$ introductory APR for $6$ months from the date of account$],[$opening$.]]],[\backslash$table$[[$After that, your APR will be $10\mathrm{.}99\%$ to $23\mathrm{.}99\%$ based on your$],[$creditworthiness$.$ This APR will vary with the market based on$],[$the Prime Rate.$]],]]$