Carrie's percent error was 28.6%
Explanation:
Step 1; From the given data Carrie predicted that she would have lesser than she actually got. She estimated that she would collect 50 cans when she actually got 70 cans.
Step 2; Her percent error is given by dividing the difference in values by the actual value multiplied by 100.
% error = (difference in values / actual value) × 100
Difference in values = 70 - 50 = 20
Claire's % error = (70 - 50)/ 70 × 100 = 20/70 × 100 = 0.28571 × 100 = 28.571%.
The 28.571% is rounded off to 28.6%