Answer:
The increase in pre-tax income 20,000
Explanation:
The fixed cost of production would remain the same whether or not the special order is taken, hence, irrelevant for the decision at hand.
The sale price for the special order=10
the variable cost per unit=6
contribution margin per unit from special order=10-6=4
The increase in pre-tax income=total contribution margin from special order
The increase in pre-tax income=5000*4
The increase in pre-tax income=20,000
Hence, accepting the order is worthwhile.