Respuesta :
					                   because it is simple.you have to do a fewer calculations than if you saved money without it.
					                
					                
					             
					                   My answer would be, so you can know how much you will end of paying for something that is lets say $125. You could end up paying $250 for that and you wouldn't even know. 
Hope this helps!!!
					                
					             Hope this helps!!!
 
					                  