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Given that the output is 8 units, the total cost is 80 yuan, and when the output increases to 9 units, the average cost is 11 yuan, then the marginal cost is ( ).
选项：

A:1 yuan;
B:19 yuan;
C:88 yuan;
D:20 yuan

发布时间：2024-05-08 23:08:56

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Given that the output is 8 units, the total cost is 80 yuan, and when the output increases to 9 units, the average cost is 11 yuan, then the marginal cost is ( ).选项： A:1 yuan; B:19 yuan; C:88 yuan; D:20 yuan

Given that the output is 8 units, the total cost is 80 yuan, and when the output increases to 9 units, the average cost is 11 yuan, then the marginal cost is ( ).
选项：

A:1 yuan;
B:19 yuan;
C:88 yuan;
D:20 yuan