If we know that p → q is true and p is true, what do we know about q? q is true q is false q must be negated q could be either true or false

p → q    is false only if p is true and q is false:

p     q     p → q

T      T       T

T      F       F

F      T       T

F      F       T

p is true and p → q is true so  q is TRUE

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