From 1960 to 1970, the consumer price index (cpi) increased from 29.6 to 48.2. if a dozen donuts cost $0.89 in 1960 and the price of donuts increased at the same rate as the cpi from 1960 to 1970, approximately how much did a dozen donuts cost in 1970?

$19.49‬

Step-by-step explanation:

48.2 - 29.6 = 18.6

18.6 + 0.89 = 19.49

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you