Question

Find the percent decrease from 133 to 120. Round your answer to the nearest tenth

Answer 1

Approximately - 9.7%

Explanation:

By using the percent change formula, you will be able to calculate the percent decrease.

(b-a)/a times 100 <-- (percent change formula)

(120-133)/133 times 100

-13/133 times 100

-9.7744%

Answer 2

9.8% decrease

Explanation:

You want the percent decrease from 133 to 120.

Percent change

The amount of change as a percent can be found using the formula ...

percent change = ((new value)/(old value) -1) × 100%

Here, the new value is 120, and the old value was 133. The change is ...

percent change = (120/133 -1) × 100% ≈ (0.90226 -1) × 100%

= -0.09774 × 100% ≈ -9.8%

The change from 133 to 120 is a 9.8% decrease.

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Additional comment

When the sign of the change is negative, as here, the change is a decrease. If the sign is positive, the change is an increase. That is, a change of -9.8% is a 9.8% decrease. (You can use either the minus sign or the word "decrease" to indicate the direction of the change. The acceptable form of the answer will depend on your grader.)

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