Write the equation of the line through (5,-4); m = 1

each shirt costs $6

The percent markup is about 66.7%
I'm guessing it is C because after you solve for n (you need to multiply the five over to isolate n), you get 20.
Answer:
I don't know how to explain the math, but I know the answer is 115 women for every 100 men.
Without the tip it was $60. If you are being asked to add the tip it will be $69