The following information summarizes the standard cost for producing one metal tennis racket frame at Spaulding Industries. In addition, the variances for one month's production are given. Assume that all inventory accounts have zero balances at the beginning of the month.

	Standard Cost Per Unit				Standard Monthly Costs
Materials	$	6.00			$	13,800
Direct Labor 2 hrs @ $2.00		4.00				9,200
Factory Overhead:
Variable		2.00				4,600
Fixed		5.00				11,500
	$	17.00			$	39,100

Variances:
Material price	$	330.00		unfavorable
Material quantity	$	860.00		unfavorable
Labor rate	$	600.00		favorable
Labor efficiency	$	2,200.00		unfavorable

What were the actual direct labor hours worked during the month?

a) 5700

b) 5400

c) 4600

d) 4300