What is the pressure inside a system when the system-side column in an open mercury manometer is 75.0 mm lower than the atmosphere side when the

What is the pressure inside a system when the system-side column in an open mercury manometer is 75.0 mm lower than the atmosphere side when the atmospheric pressure is 735 mm Hg?1. 820 kPa2. 10.0 kPa3. 108 kPa4. 75 kPa5. 88.0 kPa