A Typical Family on the Planet Econ Consumes 10 Pizzas,7

A typical family on the Planet Econ consumes 10 pizzas,7 pairs of jeans,and 20 litres of milk.In 2011,pizzas cost $10 each,jeans cost $40 per pair,and milk costs $3 per litre.In 2012,the price of pizzas went down to $8 each,while the price of jeans and the price of milk remained the same.Between 2011 and 2012,a typical family's cost of living

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