Granite Insurance Company entered into a treaty reinsurance…

Granite Insurance Company entered into a treaty reinsurance agreement with Rock Solid Reinsurance (RSR). Granite’s retention limit is $400,000 and RSR agreed to provide reinsurance for up to $2.0 million. If Granite writes an $800,000 policy, RSR is responsible for 50 percent of the losses. If Granite insures a $1.6 million risk, RSR is responsible for 25 percent of any losses. What type of reinsurance arrangement did Granite enter into with RSR?