For the credit card account, assume one month between billing dates $($with the appropriate number of days$)$ and interest of $1\mathrm{.}4\%$ per month on the average daily balance. Find $($a$)$ the average daily balance, $($b$)$ the monthly finance charge, and $($c$)$ the account balance for the next billing.

$\backslash$table$[[$reviot$,,],[$July $8,$Billing Date,$],[$July $19,$Payment,$$30$