The following materials standards have been established for a particular product: standard quantity per unit of output standard price 4.6 grams $15.05 per gram The following data pertain to operations concerning the produce for the last month: actual materials purchased actual cost of materials purchased 2,800 grams $42,000 actual materials used in production 2,400 grams actual output 500 units Calculate the materials price variance (MPV): $120 FAVORABLE (F) $140 UNFAVORABLE (U) $140 FAVORABLE (F) O $120 UNFAVORABLE (U) $20 UNFAVORABLE (U) $20 FAVORABLE (F)