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(Solved): The average price of a certain model of piano in 1992 was \( \$ 12,500 \). In 2012 , the average pr ...
The average price of a certain model of piano in 1992 was \( \$ 12,500 \). In 2012 , the average price of the piano was \( \$ 21,500 \). What is the percentage increase in the average price of the piano?