I came up with 352,500

Yes, that's right. Do you want to do the same for January's collections and I can check it, or do you think you understand now?

I think I got everything down, thank you very much!

You're welcome. :)

One more problem, it is the last part of this question which is the budgeted balance sheet for Dec 31. I got accounts receivable and inventory down, but I need help with cash, property/plant/equipment, accounts payable, common stock, and retained earnings. I'm lost trying to figure out how to get these.

I don't know if I have the full question as the original poster had a specific problem. I would suggest you use T-accounts to figure out your balances for the BS.