Suppose a cup of coffee at the campus coffee shop is $2.50 and a cup of hot tea is $1.25. Suppose a student's beverage budget is $20 per week. Suppose the student simply prefers more caffeine to less and that the tea sold has the same amount of caffeine as the coffee. The student will buy a mix of coffee and tea. b. all coffee. c. all tea. d. there is insufficient information to know