The operational amplifier used in the circuit below has an open-loop gain of Avo = 4200 V/V, an input resistance of Rin = 150 kΩ, and an output resistance of Rout = 250 Ω. Using the practical op-amp model, calculate a) the output voltage Vout (8 points); b) the closed loop voltage gain Av (8 points), c) the differential voltage vd (8 points); d) the input resistance seen by the 2.5 V source rin (8 points), and e) the output resistance seen by the 8 kΩ load rout (8 points). Ans: a) Vout = 9.989 V; b) Av = 3.996 V/V; c) vd = 2.601 mV; d) rin = 144.156 MΩ; e) rout = 246.963 mΩ.