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RE: 📷Monthly Author Challenge #6.04 Got my ticket for the World Cup | 买了世界杯一票 (by @ace108)
so that's Cost of investment $40, Gain from investment $140, that's
ROI = (Gain from Investment - Cost of Investment) / Cost of Investment =>
ROI = 100/40 = 2.5 => ROI = 250%
It it works out, it's still good investment.