Answer:
Material price variance  =$5,680 unfavorable
Explanation:
Material price variance
A material price variance occurs where materials are purchased at a price either lower or higher than the standard price. A favorable variance is recorded where the actual total cost of materials is lower that the standard cost. While an adverse variance implies the opposite.
Standard material cost of 2 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â $
28,400 grams should have cost (28,400×$7.00 )  =   198,800  Â
but did cost - i.e actual cost   (28,400×$7.20       =    204,480
Material price variance                            5680 Unfavorable