productivity - 經濟

※ 引述《shorthaircat (短毛貓)》之銘言：
: in 2007 a firm produced 60000 calculators, employing 80 workers
: each of whom worked 8 hours per day.
: in 2008 the ame firm produced 76500 calactors, employing 85 workers
: each of whom worked 10 hours per day.
: between 2007 and 2008 productiviy at firm
: a) decreasd by 4 percent
: b) remained constant
: c) increased by 8.33 percent
: d) increased by 27.5 percent
: 我作法是先設 y= Y/L
: dy/y = dY/Y - dL/L
: = (76500-60000)/60000 - (85*10*365-80*8*3650/(80*8*365)
: = 0.275 - 0.3288125 = -0.05335 <0 (沒這個答案)
: 我想問一下 我究竟錯在哪裡 計算結果明明是衰退
: 對於答案是c 其實我頗不解的
: THANKS

我算出來答案是A耶...

2007年每人每小時生產力 60000 / (80*8) = 93.75

2008年每人每小時生產力 76500 / (85*10) = 90

生產力變動：( 90 - 93.75 ) / 93.75 = -0.04

囧

是我被騙走了嗎？

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