Zip Zap Zop makes running shoes. The estimated costs, by quarter, for the coming year are given below: Q1 Q2 Q3 Q4 DM costs $89,205 $64,227 $49,955 $78,500 DL costs $125,000 $90,000 $70,000 $110,000 MO costs $301,500 $249,000 $219,000 ? Total MC $515,705 $403,227 $338,955 ? Number of units produced 125,000 90,000 70,000 110,000 Estimated unit product costs $4.13 $4.48 $4.84 ? What is the unit product cost for Q4?