Suppose Denise purchases only two goods, x and y. Initially, px = 2, py = 3, and i = 20. Then, px = 4, py = 6, and i = 30. If x is normal and y inferior for her, which of the following is true?
1) The price of good x has increased by 100%
2) The price of good y has increased by 100%
3) The price of good x has increased by 50%
4) The price of good y has increased by 50%
