Seeking $500 investment; choice of 100% ROI or equity

Hello all. Getting to the point, I recently discovered a service that is getting incredible results, and would like to use it for a website of mine ASAP. All of the expenses involved will run $500. In exchange for the investment/loan, I am offering two options:

100% return on your investment over 4 months ($200 payment 30 days after money received, $250 payment 60 days after money received, $250 payment 90 days after money received and a final $200 payment 120 days after money…

Seeking $500 investment; choice of 100% ROI or equity

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