Consider an economy in which the current level of income is $600b, "the" multiplier is 4, the marginal tax rate is 20%, the current budget deficit is $30b. To increase income to $650b we require an increase in government spending of
a) less than $10b
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b) between $10b and $15b
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c) between $15b and $20b
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d) over $20b
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