Tino works at a retail clothing store as a sales clerk and part of his paycheck is based on commission, meaning that it is determined by the value of the clothes that he sells. Each week, he earns $\$7$ an hour plus $15\%$ of his total sales. If Tino works for $18$ hours and sells $\$538$ in clothes in a certain week, what is the amount of his commission? What is his total pay for that week?