to determine the unit cost your would divide the total cost by the number sold.
7 bagels for $4.41 $4.41/7 = $.63 each at fresh side
5 bagels for $3.60 $3.60/5 = $.72 each at value mart
this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.