A little help, I cannot find how to solve this

[nilamo]

That's a massive block of text.  Could you maybe cut that down a bit so it's easier to read?  Maybe with only one or two lines of output, along with what you want the output to be?

And why not just multiply it?  

items = OPEX_evolution(25)
constant = 100
for item in items:
   print(item * constant)