The correct answer is 13924.58, and my value is 13888.51. Why my answer is off about % 0.2?
Look at the sketch again and compare it to your model. Remember you are (supposed) to be working in a 3D sketch
In fact, now that I sketched the sketch myself , I recommend starting all over and just use a 3D sketch and look closely at what and how the information is given to you.
Retrieving data ...