The weekly output of a fabrication process is shown below together with data for labour and material inputs. Standard selling price is$125per unit. Overhead is charged weekly at the rate of$1,500plus .5 times direct labour cost. Assume a 40 -hour week and an hourly wage of$16. Material cost is$10per linear foot. What is the average multifactor productivity? a. 1.475 b. 1.457 c. 1.431 d. 1.463 e. 1.422