Lewis Ltd produces and sells a single product. Each product sells for 55. Fixed costs are 500,000 per year and the break-even point of the business is 25,000 units. The profit each year is 420,000. Calculate: 1. The variable cost per unit. 2. The number of units sold each year. 3. The margin of safety (in units). Question content area bottom Part 1 Variable cost per unit = enter your response here (Round up your answer to the nearest pound.) Part 2 Calculate the number of units sold each yearenter your response here units (Round up your answer to the nearest whole number.) Part 3 Calculate the margin of safety enter your response here units (Round up your answer to the nearest whole number.)