The price of a notebook has dropped to $ 3.30 today. yesterday's price was $3.80 . find the percentage decrease. round your answer to the nearest tenth of a percent.

Step One

Find the real price drop

3.80 - 3.30 = 0.50

Step Two

Find the % reduction.

Question Which numbers do you use? 3.30, 0.50, 3.80?

The reduction % = (0.50 / 3.80 )*100 = 13.158%

 This gives you the % reduction. To the nearest 10th is is 13.2. (5 on always rounds up. It isn't true everywhere).

10% of increase is the final answer! : )