Answer:
Explanation:
so gas was selling for 3.31.......that is 85 cents cheaper then a yr before....so a year before it costs (3.31 + 0.85) = 4.16
% decrease = (decrease / original cost) * 100
= (0.85 / 4.16) * 100
= 0.2043 * 100
= 20.43% decrease <==