i need help solving both of these questions

Roosevelt Corporation has a weighted-average unit contribution margin of $40 for its two products, Standard and Supreme. Expected sales for Roosevelt are 40,000 Standard and 60,000 Supreme. Fixed expenses are $1,800,000. How many Standards would Roosevelt sell at the break-even point?

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 $60 and a selling price of $100. Q-Chip Plus has variable costs per unit of $70 and a selling price of $130. Ramirez's fixed costs are $540,000. How many units of Q-Chip would be sold at the break-even point?