I am really stuggling with this question. Could someone please walk me through the steps of how to solve this? Thanks so much, I appreciate the help.

Company produces two different remote control products with the following monthly data for the most recent month:

	Plane	Boat	Total
Selling price per unit	$300	$100
Variable cost per unit	$240	$ 60
Expected unit sales	28,000	7,000	35,000
Sales mix	80%	20%	100%
Fixed costs			$1,400,000

Refer to Exhibit 6-4. Assume the sales mix remains the same at all levels of sales. How many units of each product must be sold to earn a monthly profit of $504,000?