Answer:
The cost of the baseball cards cost with the discount is $17.1.
Explanation:
 Given : Jules purchased a box of baseball cards for her collection. The original price was $22.80, but the store was having a sale with 
 off the price of all baseball cards.
To find : How much did the baseball cards cost with the discount?
Solution : The original price of baseball cards is $22.80
There is off of 
 of the original price.
First we find the discount on original price 

Discount is $5.7 
So, The cost of the baseball cards cost with the discount is 
Cost = Original - Discounted
Cost = $22.80 - $5.7
Cost = $17.1
Therefore, The cost of the baseball cards cost with the discount is $17.1.