i find all my dimensions are right for CSWP sample question#5 but my final mass is wrong. can anybody tell me whats wrong

Hi, i was trying the sample question provided with CSWP exam and i got stuck in Question 5. I got the right answer for question number 4 and when i make modification to the part through Equations my answer is coming wrong for question 5. Can anybody tell me whats wrong with my part.

iam attaching the part file.

Thanks

SolidworksGeneral