Explanation:

The total earnings for one hour is equal to the sum of all the salaries.

$\text{total earnings = all the salaries added together}$

There are three groups of different leveled salaries. For each group, use this formula:

$\text{how many are in the group" xx "how much they make}$

There are $8$ that make $8 an hour so: 8 xx 8 =$64

There are $3$ that make $10 an hour: 3 xx 10 =$30

And there is $1$ that makes $12 an hour: 1 xx 12 =$12

Each of the groups make $64$, $30$, and $12$ dollars respectively. Remember, the total earnings is all the salaries added together. So add these three numbers together:

$\text{total earnings} = 64 + 30 + 12 = 106$

The whole group made \$106 in one hour.