A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?

Based on this understanding, it follows that if we fill a container with oil having a specific gravity 0.80 compared to that for pure water (1), then the new bottom pressure exerted by this liquid will be less than that for P due to its lower density meaning there would be fewer molecules present in given volume which reduces overall force acting upon surface area containers floor or walls come into contact directly/indirectly with fluid inside them thus resulting in lower total amount being measured near said point(s).
This effectively means that when comparing two liquids – one having SG = 1 & another SG = 0.80 – same volume would contain less mass & force pushing downwards due lack particles comprising former being heavier/denser so therefore lower overall bottom pressure should result when latter type fluid fills up space available within box/container thus providing us answer sought after our question regarding what new amount value reads upon measuring device displays after filling back up again!