什么是工资单上的variable pay mix？

这篇文章有解释：
https://www.xactlycorp.com/blog/pay-mix-differ-sales-role/
即可变薪酬组合：

Pay mix is the ratio of base salary to target incentives that make up On-Target Earnings (OTE). For example, a 60/40 pay mix means that 60% of OTE is fixed base salary, and 40% of OTE is Target Incentive (TI), or variable pay. A more aggressive pay mix formula tends to be 50/50 or 60/40, while a less aggressive range tends to be 80/20 or 90/10.
While the term “pay mix” doesn’t sound overly intimidating, how you determine pay mix policy for each sales role shouldn’t be a directionless game of darts or pin the tail on the donkey. Getting your pay mix right can mean the difference between hitting or missing your team’s quota—and keeping reps content and motivated to sell.

6/4的意思就是底薪60%，剩下的为业绩提成。