standard cost and actual cost incurred for the manufacture of 8000 units of product were as follows: standard cost actual cost direct materials 8000 lb at $30 direct materials 7750 lb at $30.20 direct labor 10,000 hours at $36.50 direct labor 10250 hours at $38 determine a the quantity variance price variance in total direct materials cost variance be the time variance rate variance in total direct labor cost variance