22% profit.
2400/2700 = 88%
100%-88% = 22%
Slope formula : (y2 - y1) / (x2 - x1)
set 1 : (12,7)....x1 = 12 and y1 = 7
set 2 : (9,6)....x2 = 9 and y2 = 6
now we sub
slope = (6 - 7) / (9 - 12) = -1/-3 = 1/3 <==
Ok. So first, we need to set up the proportion.
64/8 = x/1
Now, we can cross multiply
64*1 = 8x
64= 8x
8x/8 = 64/8
x= 64/8
Now we have to divide 64 by 8.
x=8
Our final answer: The unit rate is 8 ounces per cup.