Case wise ranges of company valuation related to revenues.
Also the first order of things should be to return back the invested money to the investors along with principle and the targeted interest.
That is the only stable way of establishing sustainable companies as opposed to the Silicon Valley Ponzi scheme model that externalises harms to the commens and only cares about selfish profits for the company and its shareholders. Hence, it’s risky and best not to accept funding from institutional investors but from a seed fund/Incubator.accelerator that understands humanity and sustainable work vectors.