Part A:
The price of a box of Luke's original brand of cereal is $10.
The price of a box of the super-saving brand is $9.
To find out how many more dollars the price of Luke's original brand is than the price of the super-saving brand, we subtract the price of the super-saving brand from the price of the original brand:
$10 - $9 = $1
Part B:
Luke buys 5 cereal boxes each month.
The price of each box of the super-saving brand is $9.
So, Luke saves $1 with each box of cereal he buys.
To find out how much money Luke saves each month, we multiply the number of cereal boxes he buys each month by the amount he saves with each box:
$1/saving * 5 boxes = $5