Stupidity

Sometimes i think how stupid i am...
Just imagine...
to find V average for half-wave rectifier with an output peak value of 200v,
is just V average= 200/ phi= 63.66..
N to find V average for full wave rectifier with the same output peak value,
is V average= (2X200)/ phi= 127.32...

I used calculator to press the value for V avarage for full wave rectifier,
then my friend said n told me the easy way...
by jz multiplyin the 1st answer with 2..=.=
How come i so stupid one..????
Hahaha....