James and Mandy’s lunch bill is $27.78. They had really good service and agree to pay an 18% tip to their server. What amount of tip will they leave?
A.$5
B.$7
C.$10
D.$18

13.*Use info from the question above* If they paid with a $50 bill, how much change will they get back?
A.$32.78
B.$12.42
C.$17.22
D.$24.18