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According to the Scranton Edison Company, utility-plant investment per employee was approximately $453,300; $492,400; $498,900; $531,900; $553,900; and $573,300 for the years 1996 through 2001, respectively. The number of employees working at the plant at the end of the year was 3,876; 3,874; 4,115; 4,252; 4,364; and 4.428, respectively. Using the annual number of employees as weights, what is the weighted mean annual utility-plant investment per employee during this six-year period?

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