45 46 47 48 49 51 52 53 54
0.15x + x <(or equal to) 50
Where x is the meal's cost (no tip included)
50 - 15% = 42.5.
x >(or equal to) 42.50.
(nothing is copied content, I copy pasted a number into the right position, feel free to check it mods)
Absolute Value is never negative, so -20 will be changed to 20