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 solution for the difference equation.
A. yn = 6720(1.1)n
B. yn = -10D + 10D(1.1)n
C. yn = 10D - 10D(1.1)n
D. yn = 6720 + 672n
E. none of these
Answer: B
Mathematics
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