Answer:
-4.08
Step-by-step explanation:
 
        
             
        
        
        
Answer:
  682
Step-by-step explanation:
620, percentage decreased by - 10% (percent) of its value = 682
 
        
             
        
        
        
You would have to make them all one form that is the same, for example if you wanted to find out if 80%, 0.75, 1/2 are the same you would have to change them into the same form. If you wanted to make them all decimals it would be 0.08, 0.75, 0.5, if you wanted to make them all percents it would be 80%, 75%, 50%, you wanted them all of be a fraction it would be 4/5, 3/4, and 1/2. I hope explained this well and this helped :)
-Madi