Kat has an e$-$tail poster business. Suppose Kat expects to sell $2,800$ posters. Her average sales price per poster is $$38$ and her average cost per poster is $$25.$ Her fixed expenses total $$7,280,$ Compute her margin of safety

a$.$ in units $($posters$).$

b$.$ in sales dollars.

c$.$ as a percentage of expected sales.

a$.$ Begin by determining the formula, then compute the margin of safety in units $($posters$).$

Expected sales in units $-$ Break$-$even sales in units $=$ Margin of safety in units

$-1$