Janice really likes potatoes. Potatoes cost $1 per pound, and she has $5.00 that she could possibly spend on potatoes or other items. Suppose she feels that the first pound of potatoes is worth $1.50, the second pound is worth $1.14, the third pound is worth $1.05, and all subsequent pounds are worth $0.30.

How many pounds would she purchase if she only had $3.00 to spend?