9 Part 7 of 10 10 points Required information Foundational Exercises [LO2, LO3] [The following information applies to the questions displayed below.] Phillips Company manufactures air-conditioning units for commercial buildings and has noticed considerable variation in shipping expenses from month to month as per the data below: eBook Month January February March April Print References May June July Units Shipped Total Shipping Expense 4 $ 2,160 $ 3,060 452368 $ 2,550 $1,284 $ 2,160 $ 2,940 $ 4,224 Foundational 3-8 8. If the air conditioners have an average sales price of $6,900, variable direct manufacturing costs are $3,450 per unit, variable manufacturing costs (excluding overhead) are $1,380 per unit, and variable selling and administration costs (excluding shipping) are $280 per unit, what is the contribution margin per unit? Contribution margin per unit