Roger has a nail that is 12 centimeters long he measures and records the length of the nail at 15 centimeters what is the percent of error in his measurement

The  percent of error in his measurement is:

                             25%

The percent error is calculated by the formula:

Roger has a nail that is 12 centimeters long he measures and records the length of the nail at 15 centimeters.

Hence,

          Hence, the percent error is: 25%.