Question

Trent told his friends it would take him 90 minutes to mow the lawn. It only took him

75 minutes. What is his percent error?

Answer 1

The answer is 16%

Explanation:

use the percent error formula.

`(|E-T|)/(|T|) *100`

in this problem,

e= 75

t=90

substitute and solve.

`(|75-90|)/(|90|) *100\\(|-15|)/(|90|)*100\\\\ .16667*100\\`

16%

we are dealing with percents so rounding to nearest whole number will suffice.

hope this helps!