Answer:
increase of $5,040
Step-by-step explanation:
Since there is excess capacity, we will not factor in Fixed costs in this special order.
Incremental profits than would be = Selling price - Variable and incremental costs.
We also eliminate any cost savings.
Per unit Profit = 19 - (18 - 2) = $3
Total impact on profits = $3 * 1680 = $5,040
If the order is undertaken a net positive impact of $5,040 will be added to the profit stream of the company.
Hope that helps.