Tech Solutions Inc. produces two different products with the following monthly data for October: Digital Cameras Tripods 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 $700,000 Assume the sales mix remains the same at all levels of sales. How many units in total must be sold to earn a monthly profit of $252,000? 4,500 9,520 17,000 12,500