Andy estimated that he would need 70 feet of lumber for a tree house project. he later found that the actual amount of lumber needed was 59 feet. what was the percent error of andy's estimation?

The percent error of Andy's estimation is 18.64 %

Solution:

Given, Andy estimated that he would need 70 feet of lumber for a tree house project

The actual amount of lumber needed was 59 feet  

We have to find what was the percent error of Andy's estimation

The error percentage is given as:

Hence, the andy’s percent error is 18.64%