The answer is 7, 7 cds were purchased, hope this helps have a great day!
SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Write the given function

STEP 2: Plot the given function
STEP 3: choose the correct graph
It can be seen from the plotted graph in step 2 that:

Hence, comparing the x-intercepts, the correct graph is seen in:
They would get approximately 3.33 ounces ( per person)
16= 6 ones or 16 ones
817= 8 hundreds and 7 ones or 17 ones
Hope this helps! :D