East company manufactures and sella a single product with a positive contribution margin.if the selling price an the variable expense per unit both increase 5% and fixed expense do not change, what is the effect on the contribution margin per unit and the contribution margin ratio? Contribution margin per unit Contribution margin ratio A. No change No change B. Increase Increase C. Increase No change D. Increase Dcrease Why this question answer is option c rather than there is no correct