Materials price variance??

Bandar Industries Berhad of Malaysia manufactures sporting equipment. One of the company's products, football helmet for the North American market, requires a special plastic. During the quarter ending June 3 the company manufactured 3,900 helmets, using 2,418 kilograms of plastic. The plastic cost the company $15,959. According to the standard cost card, each helmet should require 0.56 kilograms of plastic, at a cost of $7.00 per kilogram. Required: 1. According to the standards, what cost for plastic should have been incurred to make 3,900 helmets? How much greater or less is this than the cost that was incurred? (Round Standard kilograms of plastic per helmet to 2 decimal places.) Number of helmets 3,900 Standard kilograms of plastic per helmet 0.56 Total standard kilograms allowed 2,184 Standard cost per kilogram 7.00 Total standard cost 15,288 Actual cost incurred 15,959 Total standard cost 15.288 Total material variance-unfavourable 671