Answer
Not Plausible.
If the state raises its sales tax from 5% to 6%, it is not plausible that sales tax revenue will increase by 20%. The increase in the tax rate is 20%, so the only way tax revenue could increase by 20% would be if total spending didn't fall in response to the tax increase, which is highly unlikely. Instead, the higher tax would raise the price of goods, so people would spend less. Thus, tax revenue might go up because the tax rate is higher, but by less than 20%. There is also a possibility that tax revenues fall as a result of the tax hike.
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