If it cost $3 to fill a gas tank in 1970, how much of the same tank could be filled with $3 in 2010? About of the same tank could be filled. Average Gasoline Prices (per gallon) Price as a Percentage Price Index Year Price 1960 $0.31 of 1990 Price (1990-100) 25.2% 25.2 1970 $0.36 29.3% 29.3 1980 $1.22 99.2% 99.2 1990 $1.23 100.0% 100.0 2000 $1.56 126.8% 126.8 2010 $2.84 230.9% 230.9 (Type an integer or decimal rounded to two decimal places as needed.)