Day 21 - Optimization

After spending $32.38 for 1 particular campaign, I may have entered into optimization phase after 3 conversions.

I got revenue of $7.25 x 3 = $21.75. When investment is $32.38 and I got back $21.75
ROI = (Gains – Cost)/Cost

21.75-32.38/32.38=(-32% ROI)

According to what I have learnt, I need to hit at least -50% ROI before moving into optimization phase. So 1 more conversion and I think I am all set to go.