Question

Thoms restaurant bill is $45, and he leaves a 20% tip. What is the total cost for Thom's meal

Answer 1

20% of $45 is 9 so he leaves a $9tip+$45bill=$54for his whole meal

Answer 2

Well, 20% of that = $9, so $45 + $9 = $54 in total.
Hopes this helps