= Homework: Homework 3D If it cost $3 to fill a gas tank in 1960, how much of the same tank could be filled with $3 in 1980? About of the same tank could be filled. (Type an integer or decimal rounded to two decimal places as needed.) < Question 13, 3.D.15 > Average Gasoline Prices (per gallon) Price as a Percentage Price Index Year Price of 1970 Price (1970-100) 1960 $0.31 86.1% 86.1 1970 $0.36 100.0% 100.0 1980 $1.22 338.9% 338.9 1990 $1.23 341.7% 341.7 2000 $1.56 433.3% 433.3 2010 $2.84 788.9% 788.9