For a "non$-$ideal" transistor operating at VBE$=0\mathrm{.}7$ V$,$ measurements of its$$iC$$vCEcharacteristic show that when VCE$=10$ V$,$ IC$=2$ mA$,$ and when VCE$=20$ V$,$ IC$=2\mathrm{.}2$ mA$.$

$1)$ What is the corresponding value of IC at the saturation edge $($ note: it is the collector current when VCE$=0\mathrm{.}3$V $)?$

$3)$ What is the value of the Early voltage for this transistor?

$4)$ What is the output resistance in this BJT circuit?

$2)$ At what values of VCE$$are IC$=2\mathrm{.}1$ mA and $2\mathrm{.}8$ mA respectively?