Air enters a compressor with a stagnation pressure of 100 kPa and stagnation temperature of 27 °C and is compressed isentropically to a stagnation pressure of 900 kPa. Determine the power input for a mass flow rate of 0.02 kg/s. c_{p} = 1.005 kJ/kg·K, γ = 1.4. (answer in kW)