A manufacturer of cooking utensils sells kitchen knives. At current output levels, the knives cost $20 each to produce, of which $12 is per-unit fixed cost and $8 is variable. If the manufacturer doubled the quantity of knives sold, what would happen to costs? The total cost per knife would increase to $32. The total cost per knife would increase to $28. The total cost per knife would decrease to $16. The total cost per knife would decrease to $14