To attract business the manager of a sports equipment store decreased the price of a hockey stick from $500 to $440 what was the percent of decrease? 20% 12% 15% 60%

For this case we can make the following rule of three:
 $ 500 -----------------> 100%
 440 $ -----------------> x
 From here, we clear the value of x.
 We have then:
 
 Then, the decrement percentage is:
 
 
 the percent of decrease is:
 12%