A sales girl gave a change of N1.15 to a customer instead of N1.25. Calculate her percentage error

Answer Details

The sales girl gave a change of N1.15 instead of N1.25, which means that she made an error of N0.10. To find the percentage error made by the sales girl, we can use the formula:
Percentage error = (Error / Actual value) x 100%
In this case, the error is N0.10 and the actual value is N1.25. Substituting these values into the formula, we get:
Percentage error = (0.10 / 1.25) x 100%
Percentage error = 0.08 x 100%
Percentage error = 8%
Therefore, the percentage error made by the sales girl is 8%.