Answer:
Cost of Goods Sold will decrease by $2,679 after proration.
Explanation:
Under-applied or over applied overhead:
= Overhead incurred - Overhead applied
= $76,000 - $79,700
= (-$3,700)
Therefore, the Cost of Goods Sold after the proration:
= (over applied overhead × Overhead applied to COGS) ÷ Total overhead applied to cost of goods sold and finished goods
= ($3,700 × $57,700) ÷ ($57,700 + $22,000)
= $213,490,000 ÷ $79,700
= $2,679
Hence, the Cost of Goods Sold will decrease by $2,679 after proration.