Bluebird Manufacturing has received a special one-time order for 16,800 bird feeders at $4.80 per unit. Bluebird currently produces and sells 75,000 units at $8.80 each. This level represents 80% of its capacity. Production costs for these units are $5.30 per unit, which includes $4.05 of variable costs and $3.05 of fixed costs. If the special offer is accepted, there will be no incremental fixed cost. If Bluebird accepts this additional business, the effect on income will be:

$80,640 increase.

$12,600 increase.

$68,040 increase.

$8,400 decrease.

$68,040 decrease.