A woman needs $6720 in 12 years to pay for her child's college tuition. She wants to deposit an equal amount at the end of each year into an account paying 10% interest compounded annually. Let yn represent the amount in the account at the end of the year. 
Find the difference equation.
A. yn = 1.1yn-1, y0 = 0
B. yn = 0.1yn-1 + D, y0 = 6720
C. yn = 1.1yn-1 + D, y0 = 0
D. yn = 1.1yn-1 + D, y0 = 6720
E. none of these
Answer: C
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