please show work

Problem 10: ABC Corporation has the following insurance coverages for their commercial liability insurance program. - $3m of primary coverage per occurrence above a $1m SIR - $6m of excess coverage above $4m shared pro rata by insurers X,Y and Z. The insurers participate equally in this layer. - $5m of excess coverage above $10m shared pro rata by insurers X and Z.X provides $3m,Z provides the remaining coverage in this layer. a) Draw the coverage chart for ABC Corporation. b) How is an $8m loss split up? c) How is a $13m loss split up? d) What about a $17m loss