Suppose that the nominal tariff rate on finished computers is 12 percent and that the weighted average of the nominal tariff rates on the inputs used in producing computers is 18 percent. Thus, the effective rate of protection for the computer industry must ?

A. exceed 30 percent

B. be less than 12 percent but must be greater than zero

C. equal 6 percent

D. be less than 12 percent and can be negative

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