$.$ A single column vertical manometer $($i$.$e$.,$ micrometer$)$ is connected to a pipe containing oil of sp$.$ gr$.0\mathrm{.}9.$ The area of the reservoir is $80$ times the area of the manometer tube. The reservoir contains mercury of sp$.$ gr$.13\mathrm{.}6.$ The level of mercury in the reservoir is at a height of $30$ cm below the centre of the pipe and difference of mercury levels in the reservoir and right limb is $50$ cm$.$ Find the pressure in the pipe.