Consider the circuit represented in a) where C1=9,31 nF, R1=138,8 KΩ and  I1=2,0 mA .

Consider circuit b) and the values for Rth and Vth previously obtained.

It is known that the overall response of the voltage in the capacitor will be given by 

Vc(t)= A. (1-e^s.t )

If the capacitor is initially discharged,  what is the value for parameter A

(give your answer using 3 decimals)