Last year, GetThis, Inc sold 5,000 units for $50,000. They expect the sales price to decrease by 10% but the production variable costs per unit to increase from $6/unit to $7.50/unit. What is the companys expected change in the contribution margin dollar per unit? a. $7.50 more b. $2.50 less c. $3.50 less d. $4.50 more e. $0 no change