The student store sells pencils for $0.75 each and erasers for $0.25 each. A student can buy a bundle that consists of 2 pencils and 1 eraser for a $0.50 discount. The table shows the costs for different numbers of bundles.
# of Bundles Cost
12 $15.00
16 $20.00
Is the relationship between the number of bundles purchased and the cost proportional?
Explain how you know using the given table.
Describe what the graph of the relationship would look like.
Enter your answers and your explanation in the space provided.