[haiquyen]

I think the difference between 2 methods, it is because the difference in average C/S ratios calculated by Method 1 and method 2.

Method 1: average C/S ratio=(x*C1+y*C2)/(x*S1+y*S2)
Method 2: average C/S ratio=(x*C1/S1+y*C2/S2)/(x+y)=(x*C1+y*C2)/(S1*(x+y)+S2*(x+y))
Obviously, following method 2, it is not right to the concept of C/S ratio.

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