Answer and Explanation:
The computation is shown below
a.
For Direct materials price variance is
= (Actual price - standard price) × actual quantity
= ($2.8 - $2.75) × 145000
= $7,250 unfavorable
For Direct materials quantity variance is
= (Actual quantity - standard quantity) × standard price
= (145,000 - 150,000) × $2.75
= $13,750 favorable
For Total direct material cost variance is
= $7,250 unfavarable + $13,750 favorable
= $6,500 favorable
b. The answers are purchasing department, production supervisor and the purchasing department