104*.75=78
78/8=9.75(divide by 8 because 80%/8=10%)
9.75*10=97.5
97.5*.8=78
75% of 104 is 78 which is also 80% of 97.5
Your answer is 97.5
        
             
        
        
        
I think 2401...I just asked Siri
        
                    
             
        
        
        
<u>Let's solve this problem step-by-step</u>
<u>Let's set</u>:
    2x + 6y = 36 -- equation 1
    x + 4y = 20 -- equation 2
(equation 2) * 2
    2x + 8y = 40 -- equation 3
(equation 3) - (equation 1)
    2y = 4
    y = 2 -- equation 4
Plug (equation 4)'s value of y into (equation 2)
    x + 4(2) = 20
    x = 20 - 8
    x = 12 
<u>Thus x = 12 and y = 2</u>
<u>Let's check, by substituting these values</u>
   
<u>Answer: x = 12 and y = 2</u>
Hope that helps!
 
        
             
        
        
        
12.60 / 7 = $ 1.80 per bottle
10.98 / 6 = $ 1.83 per bottle
18.10 / 10 = $ 1.81 per bottle
16.38 / 9 = $ 1.82 per bottle
best buy (cheapest) is : $ 12.60 for 7 bottles <==
        
                    
             
        
        
        
So, the coefficients are 24, -3, and 7. The letters next to the coefficients are called "variables".