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
![(74)/(100\%)=(11)/(x)\\\\x=11(100\%)/74\\\\x=14.86\%](https://img.qammunity.org/2020/formulas/arts/middle-school/ezyntx6en3pv8tw0to2v3wkta00wmwl85i.png)
Round to the nearest percent
![14.86\%=15\%](https://img.qammunity.org/2020/formulas/arts/middle-school/db6940ox4g5zs8hu0v76ge4jwm7d2jvuvb.png)
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