Assume That the Total Daily Cost, in Dollars, of Producing

Multiple Choice

Assume that the total daily cost, in dollars, of producing plastic rafts for swimming pools is given by where x is the number of rafts produced per day, then the average cost per raft produced id given by , for . Find the level of production that minimizes average cost. ​​

A) 220 rafts per day
B) 110 rafts per day
C) 63 rafts per day
D) 6,050 rafts per day
E) 55 rafts per day