It was found that the average price for a loaf of bread in 1970, 1980, and 2000 was $0.25, $0.50, and $1.00 respectively. These results are represented in the graph below. What is the proportion of the area representing the cost of a loaf of bread in 2000 to the area representing the cost of a loaf of bread in 1970?

0.25

0.5

2

4