A box of national brand cornflakes is $2.09 for 12 ounces. A box of store label cornflakes is $3.09 for 20 ounces.

A) What is the unit price for each?

B) Assuming both brands taste equally good, which is the better buy and why?

C) If you have a 30cent-off coupon for the national brand, which is the better buy and why?