Answer:
Step 1: Calculate the change by subtracting old cost ($52) from the new cost ($64)
Step 2: Divide that change by the old cost ($52). You will get a decimal number
Step 3: Convert the decimal number to a percentage by multiplying by 100%
 
 
        
                    
             
        
        
        
Answer:
$511 
Step-by-step explanation:
If each liter costs $73$, then 7 liters is 7 times 73, which is $511.
 
        
             
        
        
        
Answer:

Step-by-step explanation:
Given : 8%
To find the decimal value of the percentage number
Remove the percentage symbol with 100 in the denominator
gives            
               
Now taking the numerator to the decimal place equal to the number of zeros in the denominator or simply divide denominator with numerator.
 Gives =   
So, the decimal equivalent of the given value is  
 
        
                    
             
        
        
        
So what they are telling you is that 5 is three higher than the variable n. 
So n = 5-3 
so n is 2.