If a rod of length 250cm is measured as 255cm long in error, what is the percentage error in the measurement?

If a rod of length 250cm is measured as 255cm long in error, what is the percentage error in the measurement?

Answer Details

% error = $\frac{\text{Actual error}}{\text{real value}}$ x 100
= $\frac{5}{250}$ x 100
= 2