Ok still not what I am after sorry. Let me try to explain better.
Let say for track its 10' long and I need one on bottom of wall and one on
top on my spreadsheet I would like to enter the lf of wall and it calculate
the ammount of track I need, cost plus 10% for waste

A1 = 100 lf wall
B1 = A1 * 2 "Now thats 200 cause I need track for top and bottom. From that
200 I need to add 10% for waste/extra/overhead/profit. so { 100 x 2 + 10% =
220 lf} Im good from here cause in another cell or what ever I can do 220/10
and it will let me know for the sectin I need 22 pieces of 10' track to build
a wall 100' long."

I just cant get it to give me 10% off of 100 x 2 if gives me 10% off of 100
which is not what I am after.

So A1 x 2 + and additional 10%

Thanks

I dont know why I get 200.1 ither why I am here. So is there a formula that
makes this correct?

       A        |       B       |        c        |
1     100             220
2

So what I am trying to get is 100 x 2 ... then an additional 10% off the 200
100 x 2 = 200 + 10% = 220
Can I do this in B2 somehow?