To determine the additional cost that the company would incur to make a profit of $1.50 per unit for the new order, we need to calculate the relevant costs and desired profit margin:

Current Cost and Selling Price: The current cost to produce one unit is $26, with $10 being fixed costs and $16 being variable costs. The product is usually sold for $30.

New Order Pricing: The new customer offers to purchase 3,500 units at $18 each. The company needs to make a profit of $1.50 per unit on this order.

Calculation:

Desired selling price to achieve the profit = Cost per unit + Desired profit = $16 + $1.50 = $17.50

Offered price by the customer = $18.00

Additional cost allowed per unit = Offered price - Desired selling price = $18.00 - $17.50 = $0.50

Therefore, the additional cost the company can incur to make the required profit per unit is $2.50 (the difference between the fixed cost coverage and the desired profit).

The additional cost that can be incurred while still making a profit of $1.50 per unit is $2.50