平均来说营业额的30%要交税，平均来说，占GDP总额4%的电信产业却贡献了7%的国家税收收入。

The average ratio of tax payments to operator revenues is 30%. On average the mobile industry, which accounts for 4% of GDP, contributes 7% of national tax revenue.

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两位经济学家估测，为平衡南北两个国家部分地区的生活水平将首先花费超过南方国家税收收入的一半以上。

To equalise the standard of living in both parts of the country would initially cost over half of the South's tax revenues.

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国库券的另一个优势是投资者的利息收入享受地方和国家税收豁免的优惠(但是，并不豁免联邦所得税)。

Another advantage of Treasuries is that interest payments are exempt from local and state taxes (however, not from Federal income taxes).

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