求助.(RoHS requirements)

下面是客户ROHS要求里面的一段原话.请教该如何理解.
Pb
Hg
CR6+
PBB/PBDEs
For which the acceptable maximum concentration value(MCV)shall not be greater than of 900PPM(0.095%), even if legal ROHS limits is 1000PPM.

此要求有给出PPM的具体值但是后面有括了一个百分号,我取值到底是取900PPM还是950PPM呢?

谢谢!