问题描述：
英语翻译
cost is a function of the number of units produced as given by :C(n)=0.02n^2-42n+5000.how many units,n,produce a minimum cost
cost is a function of the number of units produced as given by :C(n)=0.02n^2-42n+5000.how many units,n,produce a minimum cost
问题解答：
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