Answer:
19.8% is the percent error of the baker's prediction.
Explanation:
We are given the following in the question:
Total number of cupcakes sold in 1 day = 101
Predicted number of cupcakes sold = 81
We have to find the percent error of the baker's prediction.
Percentage error =

Putting values, we get

Thus, 19.8% is the percent error of the baker's prediction.