Okay, let's solve this step-by-step:
1) Capacity = Total Sales / % operated
= $375,000 / 75% = $375,000 / 0.75 = $500,000
2) Contribution Margin (CM) = Sales - Variable Costs
= $375,000 - $150,000 = $225,000
3) Break Even Point (BEP) in dollars = Fixed Costs / CM
= $180,000 / $225,000 = $240,000
So the BEP expressed in dollars of sales for Marconi is $240,000.