A zookeeper predicted the weight of a new baby elephant to be 255 pounds when it was born. The elephant actually weighed 287 pounds at birth. What was the percent error of the zookeeper's prediction?

12.4%

Step-by-step explanation:

The percent of error can be found by dividing the difference in weights by the predicted weight.

290 - 258 = 32 pounds

32/258 = 0.124

0.124 = 12.4% approximately was the percent of error