15 2.5 pts Ring Enterprises manufactures jeweled cell phone cases. The following materials standards have been established for the jewels used to decorate the cell phone cases. Standard quantity per case (grams) Standard Price (SP) per gram of jewels 4.0 $5.00 The following data relates to the production of the cell phone cases during June: Actual jewels purchased and used (grams) Actual cost of jewels purchased 1,900 $3,800 300 Actual number of cases produced What is the materials price variance for jewels in June? O $5,700 favorable O $9,500 favorable $5,700 unfavorable O $9,500 unfavorable