Ramirez Corporation sells two types of computer chips. The sales mix is 30% (Q-Chip) and 70% (Q-Chip Plus). Q-Chip has variable costs per unit of $36 and a selling price of $60. Q-Chip Plus has variable costs per unit of $42 and a selling price of $78. Ramirezs fixed costs are $540,000. How many units of Q-Chip would be sold at the break-even point?

Please show work and explanation, thanks!