Answer:
5.2 Minutes, or 5 minutes and 12 seconds
Step-by-step explanation:
You can solve this problem by working backward.  Since our number gets smaller by a 1/10 or 0.1, in order to work backward we must multiply 3.60 by 10/9, since one tenth has been taken away already.  When we do this, we get 4.0.  When we add 1.2 minutes to that, we get a final answer of 5.2 minutes, or 5 minutes and 12 seconds.
 
        
             
        
        
        
He saves $200 (the amount of change over the original amount $500
200/500  = 2/5  and 2/5 = 40%  (divide 2 by 5 and get .4 which = 40%)
40% discount is the answer to your question
        
             
        
        
        
Answer:
x=2.5906672908862554,−0.2573339575529219
 
        
             
        
        
        
Answer:
a
Step-by-step explanation: