Jean spent $16 on new t-shirts. if each shirt costs the same whole dollar amount, how many could she have bought?

If she spent 16 dollars, and each cost the same, these are the possiblieties of how many she could've bought (and for how much)

sixteen t-shirts for a dollar each
eight t-shirts for two dollars each
four t-shirts for four (tongue twister :) ) dollars each
two t-shirts for eight dollars a piece
and one t-shirt for sixteen dollars