Contribution Margin United Menchants Compary sells 21,000 unis at 447 per unif, Variable cost are $29,14 per unit, and fixed corsts arn $167,500. Determine (a) the corvtribution margin ratio, (b) the vinit contribution margif, and (c) operating inceme a. Contribution margin ratio (Enter as a whole numben) b. Unit contribution margin (Rosnd to the nearest cent.) per unit c. Operating income 1