Ronald's bill at the end of his lunch was $20.00. Using a proportion, determine the amount of his bill that he must leave for a 18% tip
A. $.60
B.$23.60
C.$3.20
D.$20.18
C. $3.20
To determine the amount of the tip, first calculate 18% of the bill:
$20.00 x 0.18 = $3.60
So, Ronald must leave a $3.60 tip, which is closest to option C.