Baker Company's sales mix is 3 units of A, 2 units of B, and 1 unit of C. Selling prices for each product are $20, $30, and $40, respectively. Variable costs per unit are $12, $18, and $24, respectively. Fixed costs are $320,000. What is the break-even point in composite units?

please tell me what formula should i use to find this, put the steps