About calculating Zein value of surfactant blends

According to a chart from Clariant Zein value of SLES is 300, CAPB is ~80, APG is ~ 20. But no one is using single surfactant. So my question is

1. Is Zein value of a blend of surfactants in shampoo correlated with % of total active surfactants?

2. Can we calculate the Zein value of a blend of surfactants if we know the value of each surfactant individually?

3. If yes then how? 
What would be the Zein value of a Shampoo %8 SLES, %2 CAPB, %2 APG active surfactants? 
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