Managerial Accounting question

Spendex has established the following standards for one of its products: Standard labor hours per unit of output 9.00 hours Standard labor rate $15.00 per hour During the current month, actual labor-hours worked were 3,500, actual total labor cost was $50,000 and actual output was 400 units. What is the labor efficiency variance for the current month? Multiple Choice O $1,500 Favorable O $1,500 Unfavorable O $4,000 Favorable O $4,000 Unfavorable