It's Yvette's turn to treat herself and her three best friends to a round of ice cream sundaes.  Alicia orders the peanut butter sundae for $7.50.  Brant orders the Royal banana split sundae for $10.00.  Josh orders the death by chocolate sundae for $8.50 and Yvette orders the cherry jubilee sundae for $9.00.  She leaves her waiter a 20% tip.  How much will her final bill be?
Please reason step by step, and put your final answer within \boxed{}.
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