Franklin, Inc., produces one model of seat cover. Partial information for the company follows: Number of seat covers produced and sold 1.500 1.700 4.200 Total costs: Variable costs $? $7 $15.750 Fixed costs per year ? ? ? Total costs: ? ? ? Cost per unit Variable cost per unit ? ? ? Fixed cost per unit ? ? ? Total cost per unit $31.00 ? ? Required: Complete the table