Answer:
$0.90 in total saved
$0.30 for each notebook
You pay $3.60
Explanation:
Find the original price $4.50
Get the the discount percentage 20%
Calculate the savings: 20% of $4.50 = $0.90
Subtract the savings from the original price to get the sale price: $4.50 - $0.90 = $3.60