DO ITI 5.5 (LO 4, 5), AP. Presto Company makes radios that sell for $30 each. For the coming year, Compute broakeren point, margin management expects fixed costs to total $220,000 and unit variable costs to be $18. of safey ratia and sales for target net a. Compute the break-even point in sales dollars using the contribution margin (CM) ratio. b. Compute the margin of safety ratio assuming actual sales are $800,000. c. Compute the sales dollars required to earn net income of $140,000