A debt of $100,000 is amortized at 6%, compounded monthly, over 25 years with 300 monthly payments of $644.30 each. The figure below includes two graphs: one shows the total amount paid (in monthly payments) as a function of time (in months), and the other shows the amount paid toward the principal of the debt as a function of time.
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Which of the answers represents how much interest will be paid on the debt after 150 months?
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A. 
, where A is the area between the two curves.
B. The area between the two curves.
C. The length of the vertical line segment from the lower curve to the upper curve at 
.
D. The length of the upper graph from the origin to the point with x-coordinate 150.
E. The area below the lower curve.
Answer: C
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