The Typical Family on the Planet Econ Consumes 10 Pizzas

The typical family on the Planet Econ consumes 10 pizzas, 7 pairs of jeans, and 20 gallons of milk. In 2004, pizzas cost $10 each, jeans cost $40 per pair, and milk cost $3 per gallon. In 2005, the price of pizzas went down to $8 each, while the prices of jeans and milk remained the same. Between 2004 and 2005, a typical family's cost of living:

A) increased by 4.5 percent.
B) decreased by 4.5 percent.
C) remained the same.
D) decreased by 20 percent.