Verify YOuR Result with the help of formula
Vc = Vs ( 1 - e^(t/T))
Vc= capacitor voltage
Vs = supply Voltage
e for exponent
t = time for charging
and
T = Tau (time constant)
Hi
38.6% is the factor from the the time given to capacitor for charging. T (time constant) http://eespex.com" time . you will always find (in practicals) that the difference between charging time and decay time is 72%. TRY IT