Kim orders a $10 meal and a drink for 2.5.  She gives a 20% tip.  She pays with a $20 bill.  How much does she get in change?
The dinner cost 10+2.5=$<<10+2.5=12.5>>12.5.
The tip comes to 12.5*.2=$2.5.
So the total cost is 12.5+2.5=$<<12.5+2.5=15>>15.
That means she gets 20-15=$<<20-15=5>>5 in change.
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