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CompuGlobal is an American firm producing computers. CompuGlobal imports computer components from India and assembles them domestically. Suppose that in the United States, a computer sells for $800 and that 60% of the computer's value comes from the value of the imported components. The United States imposes a 50% tariff on computers and a 10% tariff on the computer's components. Assume that costs of producing components are the same in the United States and India and that transit costs are nonexistent. Based on the information provided, the effective rate of protection that CompuGlobal receives from the tariff is