Zeke Company sells $25,000$ units at $$21$ per unit. Variable costs are $$10$ per i it$,$ and fixed costs are $$75,000.$ The contribution margin ration $($ rounded to the nearest whole percent$)$ and the unit contribution margin, respectively, are a$.47\%$ and $$8$ per unit b$.47\%$ and $$11$ per unit c$.53\%$ and $$7$ per unit d$.52\%$ and $$11$ per unit