Laura’s total utility from consuming 8, 9, and 10 bonbons is 35, 42, and 45, respectively. Her marginal utility from the 9th bonbon is

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Laura’s total utility from consuming 8, 9, and 10 bonbons is 35, 42, and 45, respectively. Her marginal utility from the 9th bonbon is

A.7.

B.4.67.

C.42.

D.77.

正确答案:7.

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