Physics...What am I doing wrong??

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In an experiment, a student measures the speed of sound in air to be 318 m/s at STP. If the accepted value for the speed of sound under those conditionsis 331 m/s, what is the student's percent error?
a. 3.9% b. 3.93% c. 4.09% d. 4.1%

I tried but it didn't work. This is wat I did:331-318=-13x100=-1300

  • Physics...What am I doing wrong?? -

    See my answer below at your original post.

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