A sample of an ideal gas is compressed isothermally from State \(1\) to State \(2\), as shown in the \(P\text{--}V\) diagram. At State \(1\), the gas has a pressure of \(1.5 \times 10^5 \, \text{Pa}\) and a volume of \(0.80 \, \text{m}^3\). At State \(2\), the volume of the gas is \(0.20 \, \text{m}^3\). What is the pressure \(P_2\) of the gas at State \(2\)?