Tom: Knock knock
Tom: Mary's birthday is approaching. Any ideas?
Karen: How much are we chipping in?
Henry: Even though I'd love to buy her something nice, my budget is quite tight at the moment
Mike: I think 20 each should be all right
Tom: Hm, there's 4 of us, so 80 in total
Karen: Five, Dan will chip in too
Tom: Great! I think that 100 is more than enough :)
Tom: Thanks guys!
It's Mary's birthday soon. Tom, Karen, Henry and Mike are chipping in for a gift for her.