Please show work. Thank you

Because of sales by a competing company, your company's sales of virtual reality headsets have dropped, and your financial consultant revises the demand equation to: P = 800 9.35 Where q is the total number of headsets that your company can sell in a week at a price of $p. The total manufacturing and shipping cost are $100 per headset. What is the greatest profit your company can make in a week and how many headsets will your company sell at this level? What should your company charge per headset to achieve this maximum profit? (Hint: Revenue = quantity x price & Profit = revenue - cost