$(20$ points$)$ The cascaded two$-$stage operational amplifier circuit below uses a unity gain amplifier $($voltage buffer$)$ configuration followed by an inverting amplifier configuration. You are given that $R_{\text{s}\text{i}\text{g}}=50k$ and that both op amps are ideal.

a$)(10)$ What is the output resistant two$-$stage operational amplifier circuit, $R_o?$

b$)(10)$ What is the total voltage gain, $G_V=\frac{v_o}{v_{\text{s}\text{i}\text{g}}}?$