Addition and multiplication of numbers in linked list

This is a very simple project and shouldn't take more then 1 or 2 hours. I have a linked list with 2 large numbers and I need someone to write a method that will add the 2 numbers and another method that will multiply the 2 numbers. Details of the project is posted in the attachment. My one requirement is that once I have picked a winner the project must be delivered within 5 hours . Once the project is done I will paypal you $15. Feel free to ask me any more questions (though I probably will not answer for a few hours)