How do I "write up an R.O.I."?

I've spoke with the manager of my local Applebees restaurant about running a weekly pub trivia game, he said he's willing to hire me at $75 a week with a Return On Investment (ROI) of 4 times that. That much I understand, but then he said to "write up an R.O.I." he could submit to his... show more I've spoke with the manager of my local Applebees restaurant about running a weekly pub trivia game, he said he's willing to hire me at $75 a week with a Return On Investment (ROI) of 4 times that. That much I understand, but then he said to "write up an R.O.I." he could submit to his supervisor... That would just be a number (you'll make an extra $350 a night if you hire me at $75 a night) ...what else do I put on the paper?
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