On July $12,$ the billing date, Verna had a balance due of $$156\mathrm{.}06$ on her credit card. Her card charges an interest rate of $1\mathrm{.}25\%$ per month. The transactions he made are to the right.

a$)$ Find the finance charge on August $12,$ using the previous balance method.

b$)$ Find the new balance on August $12.$

Verna made the following transactions during the month.

a$)$ The finance charge on August $12$ is $ $$

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