NO red card in a match challenge

Hi all & I hope all's well :-) Sorry to be a pain/show my maths ignorance ;-) but I'm just wondering if anybody could help me with a bit of mathematics. I'm thinking of doing a 'No red card in a match' challenge & the odd's I can find are roughly 1.3 to 1.33 & was wondering with a win added to the stake .. what would the approx payout be for say 20 or 30 or maybe 50 wins ?? Thanks for any help :-)