In January 2015 the price of gas was on average 215 per gall

In January 2015, the price of gas was on average $2.15 per gallon. This was $1.22 cheaper than a year before. What is the percent of decrease in price? (Round to the nearest percent.)

Price decreased             %

Solution

( Decreased amount)

Decrease =   --------------------------------- * 100 %

Price of gas in 2014

1.22

Decrease = --------------------------------------------- * 100 %

(2.15+1.22) since price in 2014 = price in 2015+ $1.22

= $2.15 + $ 1.22= $ 3.37

1.22

Decrease = --------------------------- *100 % = 36.2 % (Answer)

3.37