Last month you swam the 50-meter freestyle in 28.38 seconds. today you swam it in 27.33 seconds. what is your percent of change?

The distance is the same (50 meters). So we will operate only with numbers 28.38 and 27.33.

The difference is 28.38-27.33=1.05

So the percent of change is (1.05/28.38) * 100% ≈3.7%

The answer is 3.7%