The loss ratio for UW year 2021 is very high, so assume that a 'normal' loss ratio can exclude this year.
ie LR=(724+13,262+9,000)/(24,120+24,560+36,000)=27.14%
In this case, the flood claims are 28,425 - (27.14%*18,950)=23,281.
Assume reinsurance is annual and LOD.
Half the premium incepts on...