Answer:
15% increase
Step-by-step explanation:
we know that
74 hours represent the 100%
so
by proportion
Find out what percentage represent the difference between 85 hours and 74 hours (85-74=11 hours)
Let
x -----> the percent change

Round to the nearest percent

Remember that
If the percent change is greater than 1, then the percent change is an increase
If the percent change is less than 1 and greater than 0, then the percent change is a decrease
In this problem the percent change is greater than 1
so
Is an increase