Final answer:
Doug's estimate had a percent error of 18.30% when he estimated he had $25 in his jar but actually had $30.60.
Step-by-step explanation:
To calculate the percent error of Doug's estimate, we'll use the formula:
Percent Error = ((True Value - Estimated Value) / True Value) × 100%
We are given that the true value of the coins is $30.60 and Doug's estimate was $25.00.
Substituting these values into the formula gives us:
Percent Error = (($30.60 - $25.00) / $30.60) × 100%
Percent Error = ($5.60 / $30.60) × 100%
Percent Error = 0.1830065359477124 × 100%
Percent Error = 18.30%
So, Doug's estimate had a percent error of 18.30%.