For the given cost function C(x)=14400+300x+x2\displaystyle {C}{\left({x}\right)}={14400}+{300}{x}+{x}^{{2}},

First, find the average cost function. Use it to find:

a) The production level that will minimize the average cost
x\displaystyle {x} =  

b) The minimal average cost
$  

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