Step-by-step explanation: Let's start with the discount. The formula for finding the discount is the original price × rate of discount.
So here, the original price is $39 and the rate of discount is 33% off which we can write as the decimal .33.
39 × .33 = 12.87
This means that the discount of the backpack is $12.87.
Next, let's find the sale price. The formula for finding the sale price is the original price - discount.
So here, the original price is $39 and the discount is $12.87.
39 - 12.87 = 26.13
Therefore, the sale price is $26.13.