For this upgrade you will have:

R$ 0.01 in fixed earnings (guaranteed) per day in PTC (if you click every day)

R$ 0.20 in fixed earnings (guaranteed) per day in VIDEOS (if you watch every day)

= R$ 0.21 x 30 days = R$ 6.30 (you invested R$ 6 in the upgrade and earned R$ 0.30, which gives an ROI of 5% profit)

+3% ref click
+3% ref videos
+ads depending on the advertisers on the site.