Note two changes in the determination of supply that would result in a decrease in supply of a product

 Two changes that determinants of supply that can reduce the supply of a product are Tecnology and Imput Prices. When production gets more efficient, Technology is a help in the increase. But if Technology decreases and makes the product less attactive, it decreases the quality and the supply. Imput Prices increasing will cause the supply decrease.

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".

1.d 2.a c.!