Math Quiz — NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

Test Yourself Math — 11/14/12

This question is about a recent anonymous gift that paid for every high school graduate in Kalamazoo, Michigan to go to college.  How much would such a gift cost annually?