Output current \(=3 \times 10^{-3}\)

Resistance out put \(=1000\)

\(\mathrm{V}_{\text {input }}=10 \times 10^{-3}\)

Now \(V_{input}\) \(=\) \(r_{input}\) \(\times\) \(i_{input}\)

\(10 \times 10^{-3}=r_{\text {input }} \times 15 \times 10^{-6}\)

\(r_{\text {input }}=\frac{2000}{3}=\) \(0.67\,k\Omega ,\)

Voltage gain \(=\frac{V_{\text {output }}}{V_{\text {input }}}=\frac{1000 \times 3 \times 10^{-3}}{10 \times 10^{-3}}=300\)