The following costs were for Optimal View Inc., a contact lens manufacturer: Output Fixed Cost Variable Cost Total Costs 270 $ 5,300 $ 10,000 $ 15,300 320 5,300 12,000 17,300 370 5,300 14,000 19,300 420 5,300 16,000 21,300 At an output level of 500 lenses, per unit total cost is projected to be: