Yesterday's price of notebook = $3.45
Today's price of notebook = $3.20
We have to determine the percentage decrease in the cost of notebook.
Percentage decrease = (Decrease [tex]\div[/tex] Old price) [tex]\times 100[/tex]
So, percentage decrease = [tex]\frac{3.45-3.20}{3.45} \times 100[/tex]
=[tex]\frac{0.25}{3.45} \times 100[/tex]
= 7.246%
= 7.25%
Therefore, there is 7.25% of decrease in the cost of the notebook.
