The following is Arkadia Corporation's contribution format income statement for last month: 
The company has no beginning or ending inventories and produced and sold 20,000 units during the month.
Required:
a)What is the company's contribution margin ratio?
b)What is the company's break-even in units?
c)If sales increase by 100 units,by how much should operating income increase?
d)How many units would the company have to sell to attain target operating income of $125,000?
e)What is the company's margin of safety in dollars?
f)What is the company's degree of operating leverage?
g)If the tax rate is 30%,how many units must be sold to attain an after tax profit of $84,000?
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