Upperstage stage 1/6 weight with simple merlin engine. SpaceX might need to build 80 first stages if PRC reusable ends up building 80 first stages that's also reusable 30 times. Whether SpaceX can actually build and operate 80 first stages (very likely), and their associated second stages (more questionable) or realistically 100, or 200, we don't actually know, but we know basically in any mature industry PRC can outscale US capabilities, sometimes dramatically, i.e. 200-300x in shipbuilding.