Answer:
15
Step-by-step explanation
We divide the amount he's selling them for, by the amount of money he needs to make.
75 divided by 5 equals 15. 
He needs to sell 15 sports drinks to make $75.
 
        
                    
             
        
        
        
Multiply the fraction by 100%.

 
        
             
        
        
        
Ap is a line in the picture