in 2008, the price of a gallon of unleaded gasoline was $4.02. in 1990, it was only $1.37 per gallon. what is the increase expressed as a percent change? round to the nearest percent.

a. 66%
b. 393%
c. 193%
d. 134%
i need '

First get the difference between the 2008 price and 1990 which is $4.02-$1.37= $2.65. Then the difference you've got which is $2.65, divide it to the current market price which is $4.02 to get the how many percentage it increased since then, $2.65/$4.02= 0.65920398 then multiply it to 100. It would be 65.92 or 66% if rounded off to whole number.