Harriet went to the bakery to buy cupcakes for a party. She was planning on inviting 10 friends and knew she had to buy 5 extras because she had a very curious dog who would probably want one or two of them. The baker told her the cupcakes were very special and had sprinkles that glowed in the dark and made people’s smile glitter. It only cost $3.50 each. She wanted each guest to have 2 cupcakes. How much money will it cost her to have these cupcakes.