您好。同學(xué)。下面是答復(fù)。 The first step is to calculate the margin:? ?(80-50)/80=0.375 An increase in sales will have a positive effect in profit. Fixed cost is not relavant: 2.4*5%*0.375=0.045M because the extension in credit, 60-40=20 (2.4*1.05)/360*20* 0.12=0.0168M 0.045-0.0168=0.0282M? There would be a increase??