You sent out a test mailing which generates $10,000$ orders. The promotion cost $is$

$$55,000.$ The selling price $of$ the Whatchamacallit was $$50$ with a variable cost $of$

$$22\mathrm{.}50,$ thus giving a contribution $or$ unit margin $of$ $$27\mathrm{.}50.$ You were given $an$

advertising allowable $of$ $$6$$ $or\%$ signs $in$ the answer