A three-phase transformer is rated \(1000 \mathrm{MVA}, 220 \mathrm{Y} / 22 \Delta \mathrm{kV}\). The Y-equivalent short-circuit impedance, considered equal to the leakage reactance, measured on the low-voltage side is \(0.1 \Omega\). Compute the per-unit reactance of the transformer. In a system in which the base on the high-voltage side of the transformer is \(100 \mathrm{MVA}, 230 \mathrm{kV}\), what value of the per-unit reactance should be used to represent this transformer?