Simon makes 30 cakes he gives 1/5 of the cakes to sally and gives 10% of the cakes to Jane what fractions of the 30 cakes does he have left.

15 cakes left.

Step-by-step explanation:

1/5 of 30 = 6 this finds the amount given to Sally.

30 - 6 = 24 this finds the total afterward.

30% of 30 = 9 this finds the amount given to Jane.

24 - 9 = 15 This finds the total.

7.3

step-by-step explanation:

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