Power= work/time, work/time=(force x displacement)/time
therefore, power= (Fd)/t
In any given week, salesman A earns $65 per sale, so his paycheck amounts to

(where

).
Salesman B earns $40 per sale, with a weekly salary of $300, so in any given week this salesman earns

.
Salesman C earns a flat rate of $900 per week regardless of the number of sales, so his weekly pay is

.
I dont believe there is any figure we can see, take a larger picture please