Mabo company makes calculators that sell for 20$ each. For the coming year managment expects fixed cost to total 220,000$ and variable cost to be 9$ per unit.

a) compute the break even point in units

b)compute the break even point in dollars

c) compute the margin of safety percentege assuming actual sales are 500,000%

d) Compute the sales required in dollars to earn net income of 165,000$

please show all work