Answer:
silver
direct materials price  variance   =  $1,050 favorable
direct materials quantity  variance =  $13,200 favorable
Crystals
direct materials price  variance = $671 favorable
direct materials quantity  variance =$1,327.50 favorable
direct labor
direct materials rate variance =  $1,200 unfavorable
direct materials efficiency  variance =$2,100 favorable
Explanation:
silver
direct materials price  variance = (Aq×Ap)-(Aq×Sp)
                                                    = (350×$21,00)-(350×$24.00)
                                                    =  $1,050 favorable
direct materials quantity  variance = (Aq×Sp)-(Sq×Sp)
                                                          = (350×$24.00) -(1,500×0,60×$24.00)
                                                          = $13,200 favorable
Crystals
direct materials price  variance = (Aq×Ap)-(Aq×Sp)
                                                    = (3,050×$0,23)-(3,050×$0.45)
                                                    =  $671 favorable
direct materials quantity  variance = (Aq×Sp)-(Sq×Sp)
                                                          = (3,050×$0.45) -(1,500×4.00×$0.45)
                                                          = $1,327.50 favorable
direct labor
direct materials rate variance = (Aq×Ap)-(Aq×Sp)
                                                    = (2,400×$14,50)-(2,400×$14.00)
                                                    =  $1,200 unfavorable
direct materials efficiency  variance = (Aq×Sp)-(Sq×Sp)
                                                          = (2,400×$14.00) -(1,500×1.50×$14.00)
                                                          = $2,100 favorable