The price of a notebook was $3.80 yesterday. Today, the price fell to $3.30. Find the percentage decrease. Round your answer to the nearest tenth of a percent.

Answer 1

Percent is expressed through the proportion A/B = %/100, where A is the part and B is the whole.

Percent change sets the amount of change as the A, and the original amount as the B.

3.80-3.30 is .5

So, we have

(3.80-3.30)/(3.80) = %/100

(.5)/(3.80) = %/100

(.5)(100)/3.80 = %

% = 13.1578947

The % decrease is about 13.158

Answer 2

Hi Monana,

Consider $3.80 as if it were 100% of the price.

Then you have to find the percentage that corresponds to $3.30

Using proportions, we can set up the problem as follows:

Money Percentage

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If $3.80 is 100% then

$3.30 is = X

At this point, you multiply 3.30 by 100 = 330, then divide it by 3.80. The answer is 86.84

100% - 86.84% = 13.16%

The price decreased by 13.16%

Answer 3

Hi Montana P.

13.2%

(3.80 - 3.30)*100/3.80= 13.157

There are several ways to do it above I used the difference between the original price and the sale price times 100 all divided by the original price

(Original Price - Sale Price) * 100/Original Price

I hope this helps.