A decrease in the contribution margin will happen when A. fixed costs increase O B. selling and administrative expenses decrease O C. sales price increases O D. variable costs increase Steamroller Company sells two products and B. Steamroller predicts that it will sell 7,200 units of J and 6,000 units of B in the next period. The unit contribution margins are $2.95 and $6.30 for products J and B, respectively. What is the weighted - average unit contribution margin? (Round your answer to the nearest cent.) O A. $4.47 OB. $2.86 O C. $4.63 OD. $1.61