a - 9 = 6
p - 20 = -30
z - (-12) = 90
x - (-7) = -10
9 - 4
4 - 9
9 - (-4)
-9 - (-4)
-9 - 4
4 - (-9)
-4 - (-9)
- 4 - 9
A restaurant bill is $59 and you pay $72. What percentage gratuity did you pay?
Gratuity means to give gratitude. In this context, it's the same as tip.