Answer
The percent increase in the number of problems assigned is 33.3%, or approximately 33%.
Work Step by Step
To find the percent change, we use the following formula:
percent change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100%
The original number of homework problems was 60. The new number of homework problems was 80.
Substituting these values into the formula yields:
percent change = $\frac{80\ -\ 60}{60}$ $\times$ 100%
percent change = $\frac{20}{60}$ $\times$ 100%
percent change = 0.333333 $\times$ 100%
percent change = 33.3% $\approx$ 33%.
The percent change in the number of problems assigned is 33.3%, or approximately 33%.
