Problem page the price of a notebook has dropped to $3.20 today. yesterday's price was $3.45 . find the percentage decrease. round your answer to the nearest tenth of a percent.

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 Old price)

So, percentage decrease =

=

= 7.246%

= 7.25%

Therefore, there is 7.25% of decrease in the cost of the notebook.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

step-by-step explanation: