Answer:
 56% decrease or -56.00%
Explanation:
1) Find the difference between 50 and 22 as a number. 
 
2) Divide the result from Step 1 by the starting number 50. 
 
3) Multiply the result from Step 2 by 100 to get it in terms of percent. 
 
The three steps above can be made into a formula. Thus, to find the percent change from 50 to 22, we use this formula: 
 
((Y-X)/X)*100 = Percent Change 
 
X is the starting number 50, and Y is the ending number 22 that it changed to When we enter these numbers into the formula, we get: 
 
((22-50)/50)*100 = -56.00%