One way life on a farm has changed since 1800

Definitely the invention of mechanical tools, especially Cyrus McCormick's reaper.

Explanation:

https://www.farm-equipment.com/articles/4269-feature-articles---timeline-of-ag-equipment-firsts#:~:text=The%20era%20when%20farm%20equipment,the%20first%20stationary%20threshing%20machine.&text=But%20it%20was%20Cyrus%20McCormick's,equipment%20industry%20we%20know%20today.

This is a great timeline to view on the subject. :)

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".

i am 99% sure that the increase of goods was because of nafta nafta stands for the north american free trade agreement to lift tariffs