Tyreek is comparing the cost to produce footballs at four different locations, shown in the table below along with their cost structure. He estimates that demand will be $300,000$ units next year and really wants to get back to Stillwater. By how much must he lower his direct material cost per unit in order to put Stillwater in a tie for the least expensive city? $($Answers have been rounded to the nearest cent.$)$

Cost Data Stillwater Kansas City Miami Douglas

Fixed costs $$500,000$ $$650,000$ $$600,000$ $$800,000$

Direct material cost per unit $$10\mathrm{.}00$ $$11\mathrm{.}00$ $$8\mathrm{.}00$ $$7\mathrm{.}00$

Direct labor cost per unit $$3\mathrm{.}00$ $$3\mathrm{.}00$ $$4\mathrm{.}00$ $$5\mathrm{.}00$

Overhead per unit $$1\mathrm{.}10$ $$1\mathrm{.}00$ $$1\mathrm{.}50$ $$1\mathrm{.}20$

Transportation cost per unit $$1\mathrm{.}10$ $$0\mathrm{.}80$ $$1\mathrm{.}25$ $$0\mathrm{.}90$

a$.8$ cents

b$.10$ cents

c$.12$ cents

d$.14$ cents