Economic sanctions are mainly used to?

Economic sanctions are mainly used to "punish nations that disobey international law".

A sanction is a punishment imposed on another nation, or on individual natives of another nation. It is an instrument of remote arrangement and monetary weight that can be depicted as a kind of carrot-and-stick way to deal with managing universal exchange and legislative issues.  

Economic sanctions are characterized as the withdrawal of standard exchange and money related relations for outside and security strategy purposes. They might be extensive, denying business movement as to a whole nation, similar to the long-standing U.S. ban of Cuba, or they might be focused on, blocking exchanges of and with specific organizations, gatherings, or people.

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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".