Imagine there's a company named "AquaPure" that manufactures and

sells two types of water filters: the ClearStream model and the PureFlow

model. The ClearStream model is sold at $$80$ per unit with variable costs

amounting to $$50$ per unit. The PureFlow model, on the other hand, is

sold at $$150$ per unit with variable costs of $$70$ per unit.

AquaPure has fixed costs that total $$200,000$ for the upcoming year.

Market projections estimate that AquaPure will sell $15,000$ units of the

ClearStream model and $10,000$ units of the PureFlow model over the

next year.

What is the number of PureFlow water filters that AquaPure must sell to

reach the break$-$even point?