Can nonexempt workers be paid on a salary basis?

Q. “I have a question regarding nonexempt workers. Can they be paid salary, instead of hourly? For example, if an employee is hired as nonexempt, working 40 hours each week on a consistent basis, can he be paid a salary of $400 weekly. If approved overtime is worked, he is paid that in his salary also. I was told a nonexempt employee has to be paid hourly and can not be paid salary."