using tow Bc$547$b with cascade connection common emitter circuit.

The required features for a BJT amplifier are as follows.

$1.$ The supply voltage in the circuit is Vec $=10$V$.$

$2.$ The input resistance of the circuit must be at least $10$k ohm.

$3.$ The load resistance is $100$ ohm.

$4.$ The input signal of the circuit is v $=100$mV$.$sin$(2\backslash$pi $.10$kHz$.$ t$).$

$5.$ The voltage gain of the circuit should be A$,-50.$

$6.$ A coupling capacity should be used at the input and output.

$7.$ The circuit should be insensitive to $$ changes $($as much as possible$).$

$8.$ The lower cut$-$off frequency of the circuit should be less than $20$Hz$.$

$9.$ The quiescent current of the transistor in the circuit should be less than Ico $=0\mathrm{.}65$mA$.$

$10.$ The internal resistance of the signal source is Rs$=50$ohm

for Av i need to use this formula

$A_v=\frac{V_0}{V_S}=(\frac{(R_{C2}||R_L)}{r_{e2}})(\frac{(R_{C1}||h_{ie2})}{r_{e1}})(\frac{R_i}{R_S+R_i})$

i need to know all the resistances, beta, capasicitors