[phuah]

Hi,

Hope this could solve your problem:

0.105 = Kie + (1-0.3) x (Kie – 0.054) x (240.8/400)
0.105 = Kie + (0.7) x (Kie – 0.054) x (0.602)
0.105 = Kie + (0.4214) x (Kie – 0.054)
0.105 = Kie + 0.4214 x Kie – 0.0228
0.105 = Kie + 0.4214 x Kie
0.105 + 0.0228 = 1 x Kie + 0.4214 x Kie > Remark: every unknown is = x1, ie, Kie = 1 x Kie
0.105 + 0.0228 = 1.4214 x Kie
0.1278 = 1.4214 x Kie
0.1278 / 1.4214= Kie
0.0899 = Kie
Kie = 0.09 i.e. 9%

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