the student council estimated that they would have 250 people attend the homecoming dance. the number of people who actually attended was 315. what is the percent error to the nearest hundredth percent?

The answer to the question stated above is:

What are given?
      250- estimated people 
      315- no. of people who actually attended.
What is asked?
      percent error
Solve:
Subtract 250 from 315
So, the error is 65. To get the percentage error, divide 65 by 315. You will then get 0.20634...Multiply the result with 100. The percentage error then is 20.63%.