The statement a is p percent of b represents the proportion where b is base, a is a part of the base and is the percent.

The total number of laps in the Daytona is 500.

After completing 10 laps, the remaining laps in the Daytona is .

Substitute the value of in the proportion .

Multiply each side by .

Cancel common terms.

.

The percent is 8%.

The percent of the students surveyed walk to school is 8%.