Question

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

Answer 1

Let's consider that 23.5 is 100% of rainfall.
23.5 ..... 100 %
21.2 ..... x %

Calculate x:
$x = \frac{21.2 \cdot 100}{23.5} = 90.212766$, which is around 90.2%.

The percent of decrease is 100 - 90.2 = 9.8 %.