Question

A gallon of gasoline was $1.16 in 1990, which was a decrease from the price in 1980 of $1.25 per gallon.

What is the percent of decrease in the cost of a gallon of gasoline? Round to the nearest tenth of a percent
please provide the math '

Answer 1

$1.16/$1.25=x/100
116=$1.25x
÷1.25 ÷1.25
92.8=x
100%-92.8%=7.2%
So I'm fairly sure the cost gasoline per gallon decreased 7.2%.