Answer:
1) $45
2) 0.2 or 20%
3) BEP units: 7,200
4) BEP dolars 1,620,000
Step-by-step explanation:
225 sales revenues - 180 variable cost = 45 margin per unit
contribution margin ratio:
margin per unit / sales revenue per unit
45 / 225 = 0.2
break even:

324,000 / 45 = 7,200 units
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342,000 / 0.2 = 1,620,000