Answer:
66
Step-by-step explanation:
170
Because you have to add
120 + 50 = 170
let's say the bill without the tip is "x" amount, so that'd be the 100% of the bill, but we also know that 4.50 is the 18% of "x".
so if 4.50 is the 18% of "x", how much is "x"?
