“Earnings at hourly rate exclusively. If the employee is employed solely on the basis of a single hourly rate, the hourly rate is his “regular rate.” For his overtime work he must be paid, in addition to his straight time hourly earnings, a sum determined by multiplying one-half the hourly rate by the number of hours worked in excess of 40 in the week. Thus a $6 hourly rate will bring, for an employee who works 46 hours, a total weekly wage of $294 (46 hours at $6 plus 6 at $3). In other words, the employee is entitled to be paid an amount equal to $6 an hour for 40 hours and $9 an hour for the 6 hours of overtime, or a total of $294.” (U.S. Department of Labor)