SOLVE THIS URGENTELY

The standard mix of a product is as follows: Material X 60 units @$15 per unit Material Y 80 units @$20 per unit Material Z 100 units @$25 per unit Actual Mix was: Material X 640 units @$20 per unit Material Y 960 units @$15 per unit Material Z 840 units @$30 per unit Actual output of finished product was 90 units. Calculate material variance