SOLUTION: John was driving down the highway at 70 mph when he spotted a highway patrolman. Not being a rich kid, he decided to brake to 55 mph. What was the per centage change in his speed.

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Question 209105: John was driving down the highway at 70 mph when he spotted a highway patrolman. Not being a rich kid, he decided to brake to 55 mph. What was the per centage change in his speed.
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
(70-55)/70 = 15/70 = .2143 = 21.43 %