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Could you please show me then, how would you calculate amount of 15% for this post? I can’t find where I did wrong calculation;(

Not in post but about "sports hat" and every boost with %

If you buy 4+ you start see the profit like you write

To profit with percentage boosts you need to get more than 66,6 AFIT per report.

My calculations are correct, if you like to prove me wrong prove it with math, thanks.

Ok then i will make it with math.
Not to prove you wrong but to explain the meaning behind the boosts

Please have a look: your report from 14/08/2022. You got 135 boost total is 100.

Without any boost your reward is 35.

You got 80 AFIT from water bottles and running shoes.

So 4 sports hats gave you approximately: 135-80-35=20 AFIT

20/4=5 AFIT per report from one sports hat. You spent 40 AFIT per REPORT and got just 20 AFIT back.

Like i write I'm not try to make be wrong i only want to try help people understand every boost have a meaning