I have no "thank you"-button here but I agree with KK and his explanation. 
I am always mad at those slots where there is an annoying sound which gratulates you to your win when your "win" was lower than your bet..
IE if the player wagers 100 and has 30 in return at the end of wagering 100 then the RTP would be calculated as 30%.

I am always mad at those slots where there is an annoying sound which gratulates you to your win when your "win" was lower than your bet..

IE if the player wagers 100 and has 30 in return at the end of wagering 100 then the RTP would be calculated as 30%.