this is only one question, & thank you!!!

Rusty, Inc. is the sole distributor of a computer product that sells for $50 per unit, and has a contribution margin ratio of 30%. The company's fixed expenses are $200,000 per year, and variable costs per unit are $30. Rusty plans to sell 18,000 units this year. Required: a) What is the break-even point in units sold? b) What is the break-even point in sales dollars? c) How many units must be sold to attain a target profit of $50,000 per year? d) Assume that by using a more efficient machine, the company is able to reduce its variable expenses by $4 per unit. What is the company's new break-even point in units