) The typical family on the Planet Econ consumes 10 pizzas, 7 pairs of jeans, and 20 gallons of milk. In 2016, pizzas cost $10 each, jeans cost $40 per pair, and milk cost $3 per gallon. In 2017, the price of pizzas went down to $8 each, while the prices of jeans and milk remained the same. Between 2016 and 2017, a typical family's cost of living: A) increased by 4.5 percent.