What is the pressure inside the container?

A cook puts 9.60 g of water in a 2.00-L pressure cooker that is then warmed to 530°C. What is the pressure inside the container? (Assume room temperature is 20°C.) ?=kPa

I thought to use PV=nRT and P1/T1=P2/T2 then add the two together, but I got the wrong answer.
2 answers 2