Shelley Company bought 3,000 pounds of materials for $2,850. They used 2,800 pounds to produce 1,000 units of output. Direct labor costs ttaled $20,400 for 600 hours of work. Standards have been set as follows: Direct Materials: 2 pounds @ \$1.10 per pound Direct Labor: .5 hours @ $32 per hour The materials purchase price variance is: $420 unfavorable $420 favorable $450 unfavorable $450 favorable $230 favorable