Natural gas in a 100 L tank at a pressure of 2000 psi is allowed to escape into the atmosphere at Klamath Falls which has an atmospheric pressure of...

Natural gas in a 100 L tank at a pressure of 2000 psi is allowed to escape into the atmosphere at Klamath Falls which has an atmospheric pressure of 660 mmHG. What will the volume of the natural gas be under these conditions assuming the temperature remains the same.

Please help me calculate this

Is this a Boyles Law problem?

Do I need to convert psi to mmHG or vice versa?