Oil with a surface tension of $0\mathrm{.}01\frac{N}{m}$ is trapped in a bed of material with permeability of $1{10}^{-10}{m}^2$ and a length of $160m.$ We want to push the oil out of the bed by pumping in an extraction fluid $($neglect the properties of this fluid$)$ at $11000$kPa. When the oil stops coming out, what fraction of oil will be left in the bed?