Korinne has an e-tail poster business. Suppose Korinne expects to sell 1,200 posters. Her average sales price per poster is $30 and her average cost per poster is $26. Her fixed expenses total $2,120. Compute her margin of safety a. in units (posters). b. in sales dollars. c. as a percentage of expected sales. OCED a. Begin by determining the formula, then compute the margin of safety in units (posters) Margin of safety in units