Yes, but I wanted to calculate needed ROI, not a needed return in STU, while also explaining how I came to a result, not just give a formula, since many steemians don't know what are STU's and post would be too short to monetize it :D Thanks for the comment and resteem, I appreciate it :)
RE: How Much Your ROI Has To Be To Return Your Invested SBD When Buying Upvotes(Based On The Price Of SBD)?