Adger Corporation is a service company that measures its output based on the number of customers served. The company provided the following fixed and variable cost estimates that it uses for budgeting purposes and the actual results for May as shown below:

When preparing its planning budget the company estimated that it would serve $30$ customers per month; however, during May the company actually served $35$ customers.

$2.$ What amount of employee salaries and wages would be included in Adger's flexible budget for May?