Answer and Explanation:
The computation is shown below:
a.
Direct material price variance is
= ($7 - $7.28) × 31,100
= $8,708 Unfavourable
b.
Direct material quantity variance is
= (2,700 × 12 - 31,100) × $7
= $9,100 Favourable
c.
Direct material cost variance is
= $9,100 - $8708
= $392 favorable
In this way, it should be calculated