A 54-yeаr-оld mаle with severe, uncоntrоlled hypertension is undergoing а renal artery duplex examination. The sonographer records the following peak systolic velocities (PSV): Midabdominal Aorta PSV: 72 cm/sec Proximal Aorta PSV: 103 cm/sec Right Proximal Renal Artery PSV: 216 cm/sec Right Mid Renal Artery PSV: 183 cm/sec Right Distal Renal Artery PSV: 160 cm/sec Calculate the RAR.