# Percent Over Last Year

Feb 16, 2010I want to find the percent of increase over last year. If last year was 100 and this year is 500 then the percent would be 500%. However things get tricky if last year was -100 and this year is 500 or if last year was 100 and this year is -500 then it get's screwy and I'm not sure what formula to use to handle any situation.