22. Houston Industries produces a product that requires 2.6 pounds of materials per unit. The allowance for waste and spoilage per unit is . 3 pounds and .1 pounds, respectively. The purchase price is $2 per pound, but a 2% discount is usually taken. Freight costs are $.10 per pound, and receiving and handling costs are $.07 per pound. The hourly wage rate is $12.00 per hour, but a raise which will average $.30 will go into effect soon. Payroll taxes are $1.20 per hour, and employee benefits average $2.40 per hour. Standard production time is 1 hour per unit, and the allowance for rest periods and setup is .2 hours and .1 hours, respectively. The standard direct labor rate per hour is $12.00 $12.30 $15.60 $15.90