Step-by-step explanation: If the price is being marked up by 50%, you take 50% or half of the original price of $95, which is 47.5, and add it to your original price.
The first thing that you would want to do is find the slope between points C and M. Once you find your slope, "repeat" it on the other side of your midpoint. Now you can find the coordinates of D; (0,7).