SOLUTION: An ice cream truck vendor sold 8 gallons of ice cream a day during the summer of 2008. In the summer of 2009 he only sold 7 gallons a day. What percent did his sales decrease?

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Question 920818: An ice cream truck vendor sold 8 gallons of ice cream a day during the summer of 2008. In the summer of 2009 he only sold 7 gallons a day. What percent did his sales decrease?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You don't know the cost of a gallon of ice cream
You can make uyp any cost like $1 / gal
+8%2A1+=+8+ dollars for 2008
+7%2A1+=+7+ dollars for 2009
The AMOUNT of the decrease in sales is:
+8+-+7+=+1+ dollar
The FRACTION of the decrease in sales is:
+1%2F8+
The PER CENT of the decrease in sales is:
+%28+1%2F8+%29%2A100+=+12.5+ %