How is the Sigma function used?
I am trying to find the sum:

10
Sigma .5^x * .2 (= .399805)
x=0

If understand the manual correctly, I am supposed to enter the counter in the x stack as ccc.fffiii:

So I would enter 0.01001? (final = 10, increment = 0, c = 0)

I am not getting the answer I expected. Please help.

Here is what I have:

LBL FF
.
5
x<>y
y^x
.2
x
RTN

.01001 g [3] f [ENTER] FF ?? (I'm not getting what I am expecting, I get .2000)

Thanks in advance.