If the employee is paid a flat sum for a day's work or for doing a
particular job, without regard to the number of hours worked in the day
or at the job, and if he receives no other form of compensation for
services, his regular rate is determined by totaling all the sums
received at such day rates or job rates in the workweek and dividing by
the total hours actually worked. He is then entitled to extra half-time
pay at this rate for all hours worked in excess of 40 in the workweek.
