If an employee earns $15 per hour and works 40 hours a week, what type of pay plan does he have?

The employee in this scenario is earning a specific amount for each hour worked, which is a characteristic of an hourly wage pay plan. Earning $15 per hour signifies that the employee is compensated based on the number of hours they work rather than receiving a fixed salary regardless of hours worked.

In a salary pay plan, an employee typically receives a set amount of money per pay period, regardless of how many hours they work. Since this employee's pay fluctuates with the number of hours worked—$15 for each of the 40 hours—the appropriate classification for their pay method is an hourly wage rather than a salary.

Additionally, the other options involve different compensation structures such as salary plus commission or straight commission, which would not apply here since the payment is directly tied to each hour worked with no indication of commissions or bonuses based on performance or sales.