Calculate precentage complement.

I am trying to calculate precentage change and percentage complement.
Let's p = 20% and pComp = ?
Here is a manual calculation of pComp
100 + p(20%) = 120
120 - pComp = 100
pComp = 16.6%

Is there a simple formula for it ?
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pComp = ((pValue - 100)/pValue)*100

pValue = 120

psokoloAuthor Commented:
I would need a formula that would calculate pComp with p as the only parameter.

Thanks for intput.
pComp = p/(1+p)

(1 + p) * (1 - pComp) = 1
1 + p - pComp - p*pComp = 1
p - pComp - p*pComp = 0
pComp (-p - 1) = -p
pComp = p/(1+p)

p = 20% = 0.2
0.2/(1+0.2) = 0.2 /1.2 = 1/6 = 0.16666... = 16.7%

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