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1.) suppose that you also want to buy a cake for the party. you go to the supermarket to buy a cake, and
see that all of the cakes they offer are square. the cheapest sheet of cake costs $15.60 and it serves
80 people. you can buy any fractional part of the cake and pay that fraction of $15.60. you are
asked to buy 4 of a full pan. how much would it cost you if the store charges 7% tax on top of the
amount you paid for the cake?