Assume the following $(1)$ variable expenses $=$ $$300,000,(2)$ unit sales $=10,000,(3)$ the contribution margin ratio $=25\%,$ and $(4)$ net operating income $=$ $$10,000.$ Given these four assumptions, which of the following is true?

Multiple Choice

The total fixed expenses $=$ $$75,000$

The break$-$even point is $8,000$ units

The contribution margin per unit $=$ $$10$

The total sales $=$ $$375,000$