Respuesta :

Answer:

$6.9

Explanation:

If gallon of milk cost 1.12 in 1970, we can calculate the expected price in 2009 per gallon of milk using the proportion below:

2009 price/214.5 = $1.12/38.8

=>Find the expected price of 2009 by cross multiplying

38.8 × 2009 price = 1.12 × 214.5

38.8 × 2009 price = 240.24

=>Divide both sides by 38.8

2009 price = 240.24/38.8

2009 price = 6.19175258 ≈ 6.19

Expected price of gallon of milk in 2009 = $6.19