※ 引述《shorthaircat (短毛猫)》之铭言： : 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 : 我作法是先设 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 (没这个答案) : 我想问一下 我究竟错在哪里 计算结果明明是衰退 : 对於答案是c 其实我颇不解的 : THANKS 我算出来答案是A耶... 2007年每人每小时生产力 60000 / (80*8) = 93.75 2008年每人每小时生产力 76500 / (85*10) = 90 生产力变动：( 90 - 93.75 ) / 93.75 = -0.04 囧 是我被骗走了吗？ --

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