please help. I'll give you extra points.

Answer:
See below
Step-by-step explanation:
Part A: For the current year, we notice that the price of corn is directly proportional to the number of bushels at a rate of $8 per bushel. We know this because 2 bushels * $8 = $16, 4 bushels * $8 = $32, and so on.
Part B: The rate for the previous year is $6 per bushel, so the current year rate is $2 more than the rate for the previous year