I need the background removing from 50 photos with plain backgrounds

Design details: Hi,
I need the backgrounds removing from 50 pictures with plain backgrounds. I need this doing as quickly as possible (within the next 2 days). I would like them done as accurately as possible as some of them may be expanded in size as they are to be used on various media for advertising. I would like them saved in a png format.
Ideas for the visual style: none
Extra notes: I have added a couple of files below, I cannot add the others as the file sizes are too large