This problem is similar to the one here: http://www.mathhelpforum.com/math-he...nt-urgent.html

For (a)

The fixed cost is 250. The variable cost is 1.2x, where x is the quantity of the good. Since the price is 3.2, the total revenue will be 3.2x.

Break even point: Where total revenue = total cost

i.e. where 3.2x = 250 + 1.2x

(solve for x)

For (b)

Profit = Total revenue - Total cost...

Profit = 3.2x - (250 + 1.2x)

let x=3000...and what do you get?