Zeke Company sells 25,000 units at $21 per unit. Variable costs are $10 per unit, and fixed costs are $75,000. The contribution margin ratio (rounded to the nearest whole percent) and the unit contribution margin are Oa. 52% and $11 per unit Ob. 47% and $1 1 per unit Oc. 53% and $7 per unit Od. 47% and $8 per unit