The price of a notebook has risen to $3.45 today. Yesterday's price was $3.20. Find the percentage increase. Round your answer to the nearest tenth of a percent.

7.8%

Step-by-step explanation:

Yesterday's price = $3.20

Today's price = $3.45

Increase = today's price - yesterday's price

That's $3.45 - $3.20

= $0.25

Percentage increase = increment / yesterday's price x 100%

That's $0.25/$3.20 x 100%

0.0781 x 100%

7.81

7.8%