The diameter splits the circle into 2 equal halves by going through the midpoint of the circle. The two halves are called semicircles.
Isolate the variable by dividing each side by factors that don't contain the variable.
l = v/wh
w
h
You're answer is the third one, you gotta divide the money by the hours worked and then compare.
X = 40, Y = 15
40(2) + 15(2) = 80 + 30 = 110 :)