Suppose compensation is given by W = 450,000 + 220 π + 15S, where W = total compensation of the CEO, π = company profits (in millions) = $300, and S = sales (in millions) = $500. What percentage of the CEO's total earnings is tied to profits of the firm?

Total compensation=450,000+220*300+15*500=523,500
Fixed salary=450,000
Total earnings=Total compensation+Fixed salary=973,500
So percentage of the CEO's total earnings is tied to profits of the firm
973,500/300,000,000=

这样算错在什么地方，为什么参考答案是12.6%？