Differential Aralyzit far Sale: Promption Proposal promobanal actvities. The following data have been absembied for their possible usefutness in dociding which of the products fo select for the campaipni charging the unit selling price of either product. Required: af cequirec, ine a minus sign to indicate a lons. changeg the unit sellibg price of either probuct. Atequired: If requirech, ate o fhinust aigh to incicege a lots