Question

Last year Austin, Texas received 23.5 inches pf rainfall. This year Austin received 21.2 inches of rainfall. Find the percent of decrease in the number of inches in rainfall. Round your answer to the nearest tenth of a percent, if necessary.

A. 2.3%
B. 9.8%
C. 10.8%
D. 13.6%

Answer 1

percent decrease=decrease/original times 100
decrease=23.5-21.2=2.3
original=23.5

percent decrease=2.3/23.5 times 100=0.0978 times 100=9.8%

B is answer

Answer 2

Answer: B. 9.8%

Explanation:

Hi, to answer this question we have to use proportions

since 23.5 is the 100% = 23.5 inches /100 %

For 21.2 inches =21.2inches /x%

23.5/100 =21.2/x

Solving for x:

x = 21.2 / (23.5/100)

x = 90.2%

21.1 inches are 90.2% of 23.5 inches.

So, the percent decrease is:

100% - 90.21 % = 9.8 %

Feel free to ask for more if needed or if you did not understand something.