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【单选题】
Samara's income is $30 a month and she spends all of it on music downloads and gasoline. The price of a music download is $3 and the price of a gallon of gasoline is $3. At Samara's best affordable point, her marginal rate of substitution is ________ gallon of gasoline per music download.A.
0.5
B.
1
C.
1.5
D.
More information is needed to determine the marginal rate of substitution.
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