Required:

a$.)$ Should Stafford accept this one$-$time special order?

b$.)$ Cupp$$s manager calls again: They$$ve run some new calculations, and they really need X systems at the same $$65$ price. It will have to be an all$-$or$-$nothing deal. This order will displace some of the volume sold to regular customers who are a lot more profitable. Assuming that Stafford$$s regular customer relationships will not suffer due to a small one$-$time volume reduction, and based on financial considerations alone, what is the maximum value of X$?$