Charleston Ltd. manufactures school desks. The companys forecasted income statement for the year, before any special orders, is as follows: Amount Per Unit Sales $30,000 $20 Cost of goods sold 24,000 16 Gross profit 6,000 4 Selling expenses 4,500 3 Net operating income $ 1,500 $ 1 Fixed costs in the forecasted income statement are $13,500 in manufacturing and $2,700 in selling. The company has capacity to produce 2,000 units, but has received a special order for 800 units at $15 from an overseas company, and would have to replace some of its regular business to accept it. Charleston will incur an additional $3 per unit in shipping should they accept the offer. 1. Calculate Charlestons current contribution margin per unit. 2. Should Charleston accept the special order for 800 units? 3. Assume the special order had the same terms, but was for 300 units. Should Charleston accept it?