X would =18 because 18+2= 20
20 x .5 = 10
X = 18
2.25/12.50 = 0.18. then turn 0.18 into a percentage by doing 0.18 x 100 = 18%. Therefore, he gave an 18% tip.
You out 1 in for A and 12 in for C 4(1)(12) = 48
The correct answer is 16/81. Hope this helps.
