Nation Incorporated sells three products. Last month's results are $*$

as follows: $($SEE TABLE BELOW$)$

Total fixed costs are $$100,000$ marketing and $$125,000$

administrative.

Required:$($a$)$ What was the operating profit last month?

$($b$)$ What is Nation's break$-$even sales volume $($at the given mix$)?$

$($c$)$ What is Nation's margin of safety?