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A quick way to increase a number by a percentage, is to find the percent of your number, and add it to your number.
So, suppose George got a hot stock tip from a friend about some kind of robot butcher. George bought the stock for $10 and it went up 37%. How much is George's stock worth?
You could also solve this problem by multiplying 10 * 1.37, which also gives you $13.70
If George did this trick he could have saved a lot of time, and had an easy summmer. "The Summer of George!"