on 15 et red All else being equal, what happens to the unit contribution margin and the contribution margin ratio if the sales price per unit decrease? ed out of g question Select one: O a. None of the given answers. O b. Both unit contribution margin and contribution margin ratio increase. c. Unit contribution margin decreases and contribution margin ratio decreases. O d. Both unit contribution margin and contribution margin ratio are unchanged. O e. Unit contribution margin increases while contribution margin ratio decreases