A four-step production process has attrition losses at the second and fourth resources. The percentage of loss is 20% at the second resource and 30% at the third resource. The capacities of the resources are as follows:

Resource A: 240 units/hour

Resource B: 240 units/hour

Resource C: 190 units/hour

Resource D: 190 units/hour

(a) What is the amount of material in units per hour that has to be processed at the start of the process (i.e. before the first step) so that the process can yield a good output of 100 units per hour of the final product?

(b) What is the yield for Resource A?

(c) What is the yield for Resource B?

(d) What is the yield for Resource C?