how much change should she get back

Answer:
The teachers spends a total of $64.00 on books and in change gets $36.00 back.
Step-by-step explanation:
We know that the teachers has a 100 dollar bill. Since she has a graph, we add all of the books she buys together. So 10+ 12+12+14+16= 64. So she spends 64 dollar. So now we need to subtract 64 from 100. So 100 - 64 equals 36 dollars. So our answer of money she gets back is 36 dollars.