Month Direct Labor Hours Production Costs May 3,600 $15,000 June 4,800 17,500 July 6,000 20,000 August 4,800 17,500 Totals 19,200 $70,000 Let a = Fixed production costs per month b = Variable production costs per direct labor hour n = Number of months X = Direct labor hours per month Y = Total monthly production costs S = Summation Predict a cost for 5,000 labor hours. a. $16,667 b. $17,900 c. $17,700 d. $30,400