Question

how much more did briana save by purchasing a backpack that cost $45 with a sales promotion of 20% off instead of a backpack that cost $42 with a sales promotion of 10% off?
$1.80
$3.00
$4.80
$6.30

Explanation:

Step1: Calculate the discount for the first backpack

The first backpack costs $45 with a 20% discount. The discount amount is \(45\times0.20 = 9\) dollars. So the price after discount is \(45 - 9=36\) dollars.

Step2: Calculate the discount for the second backpack

The second backpack costs $42 with a 10% discount. The discount amount is \(42\times0.10 = 4.2\) dollars. So the price after discount is \(42 - 4.2 = 37.8\) dollars.

Step3: Calculate the difference in savings

To find out how much more she saved, we subtract the price of the first backpack after discount from the price of the second backpack after discount. \(37.8-36 = 1.8\) dollars.

Answer:

\(1.80\) dollars (Option A)