w
-7/8
step-by-step explanation:
instead of subtracting you add the -6/8 and -1/8
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