Question

Lacey stopped at Littletown market to buy 10 cookies for her book club. Littletown Market sells 9 cookies for $8. On her way home, Lacey passed by another store, Collegetown Bakery. Collegetown Bakery sells 13 cookies for $30. Lacey figured out she got the better deal. How much did she save by buying her cookies at Littletown Market?

Answer 1

First, use division to determine the unit rate of one cookie (sorry if terminology is wrong, but i do know how to do it).

Little town = 9/$8 = $1.125 per cookie
College town = 30/$13 ≈ $2.3076 per cookie

Now we are sure of how much each costs and can determine how much she would have spent at each place.

Little town= $1.125*10= $11.25
College town= $2.3076*10≈ $23.08

Now, subtract little town from college town to figure out the savings.

23.08-11.25= $11.83

Thus, she saved $11.83.