What are tariffs? a) political boundaries between nations b) military blockades of specific countries c) disputes between state governments over boundaries d) taxes on the import or export of goods from a country

The correct answer is option D.

Tariffs are defined as an import or export tax on goods between sovereign states. The main purpose behind tariffs is to help or encourage local or national industries or markets so they can remain competitive. They are often used to help level or equalize the trade balance or trade deficit with other nations as well as to protect local industries in their infancy and to foster what's called 'import substitution industrialization'.

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explanation:

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".