A firm currently produces \[100\] units of output and has fixed costs of \[\$1000\], variable costs of \[\$8000\], and the marginal cost of \[\$100\] for the \[100^{\text{th}}\] unit. What is the average total cost of producing \[100\] units? Choose 1 answer: Choose 1 answer: (Choice A) \[\$90\] A \[\$90\] (Choice B) \[\$70\] B \[\$70\] (Choice C) \[\$80\] C \[\$80\] (Choice D) \[\$91\] D \[\$91\] (Choice E) \[\$100\] E \[\$100\]