D Solly Corporation produces a product for national distribution. Standards for the product are: Labor: 2 hours per unit at $8 per hour. During the month of December, the company produced 1,000 units. Information for the month follows: . Labor: 2,500 hours worked at a total cost of $20,625. The labor rate variance is: O $625 U O $500 F O $500 U O $625 F