3. Carl decides to buy 7 new scratch posts for his cats for Christmas (he personally adopted 28 cats and lives alone with them). The next day, Carl decides to go back to the store to
purchase 3 more scratch posts since 7 just isn't enough for all of his cats. He then
realizes that he should probably buy a few for his organization "Carl Cares for Cats" and
returns to the store to buy 4 more. If Carl spent a total of $224.42, how much was each
scratch post?