Last year a pair of pants had a price of $20 and this year the price is $25. Which of the following expresses this price change accurately?
A. If last year is the base year, the index number for this year would be 80.
B. If this year is the base year, the index number for last year would be 120.
C. If this year is the base year, the index number for last year would be 80.
D. If last year is the base year, the index number for this year would be 120.
Answer: C
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