The owner of a driving range is trying to determine the value of hiring additional part time help. If she is able to hire someone to work in the shop for $15$ hours per week for $$10$ per hour, she estimates that she can teach approximately $10$ additional lessons for which she charges $$40$ per lesson. The value of hiring a new employee is:

A$.$

$$250$

B$.$

$$400$

C$.$

$$100$

D$.$

$$150$