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 increased to $14 each, while the price 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.

Between 2004 and 2005, a typical family's cost of living increased by 9%

Explanation:

In 2004, a family consumes 10 pizzas, 7 pairs of jeans, and 20 gallons of milk with pizzas cost $10 each, jeans cost $40 per pair, and milk cost $3 per gallon.

Therefore in 2004, the money spent by the family = ($10 × 10) + ($40 × 7) + ($3 × 20) = $100 + $280 + $60 = $440

In 2005, the family consumes 10 pizzas, 7 pairs of jeans, and 20 gallons of milk with pizzas cost $14 each, jeans cost $40 per pair, and milk cost $3 per gallon.

Therefore in 2005, the money spent by the family = ($14 × 10) + ($40 × 7) + ($3 × 20) = $140 + $280 + $60 = $480

Therefore between 2004 and 2005, the money increased from $440 to $480.

The percentage increase between 2004 and 2005 = = 9%

Between 2004 and 2005, a typical family's cost of living increased by 9%

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