I got 300 F for DM purchase variance but not sure how to solve for DM efficiency variance, also could you explain exactly how to determine if the variance is favourable or unfavourable I keep getting confused

11. A company developed the following per-unit standards for its product: 2 pounds of direct materials at $6 per pound. Last month, 1,000 pounds of direct materials were purchased for $5,700. During last month, the company used 500 pound in producing 200 units of output. The direct materials purchase price variance and direct material efficiency variance, respectively, for last month were a. $300 F and 600 U. b. $300 F and 100 U. c. $150 F and 600 U. d. $300 U and 100 F. e. None of the above