CSWP Preparation

I am preparing for CSWP right now. 
I am confident that I have modeled appropriately. But I don't receive the required the result. I have provided the screenshot of my question. I receive the result as 58775.12 where I am supposed to get 58776.43. The difference might me very low. Due to this issue, I get drastic variation in my subsequent questions and answers. 

SolidworksModeling And Assemblies