A package of strawberries cost $1.50 while they are in season and $2.25 when they aren't in season. What is the percent increase?
1.50 - in season
2.25 - out of season
1.50 X
------ = --------
2.25 100
150 = 2.25x
/2.25 /2.25
x = 66.66
the percent increase is 66.66% (2/3rd of 100)