The intervall of the rtp should be mentioned in the rules and is somewhat between 90.57 and 96,58%
You can split the rtp into each round and add them.
the rounds over 4 may get a high multiplier, but are such unlikely, that it hasnt
any practical influence on the rtp.
round 1:
segments/54*(payout*multiplier+1)
e.g. blue,yellow,red:
blue1=15/54*3 = 0.833 (so 83% without the respins,but still counting the segments)
yellow1= 23/54*2=0.852
red1=1/54*41=0.76
round 2:
2x 7x in the first round, but not 2nd:
blue2=1/54*15/54*(2*2+1)+1/54*15/54*(7*2+1)=0.0257+0.0771=0.10286
yellow2=0.0868
red2=0.124
round 3:
including 2x 7x in first+second round
blue3=1/54*1/54*15/54*(2*2*2+1)+1/54*1/54*15/54*(7*2*2+1)*2+1/54*1/54*15/54*(2*7*7+1)=0.017
yellow3=0.012
red3=0.02
round 4:
.including 2x 7x in first+second+third round, calc yourself,only small effect anyway
.
total for three rounds:
blue=blue1+blue2+blue3=0,923
yellow=0.951
red=0.904