I think the question about how to calculate L was already answered in my last replay and I showed two ways of doing it.
The result is not what you expected but you didn't answer the question why you think that (200; 200; 200; 200; 50) is the result and how you would calculate to get that result.
The formula given in your file is a bit different from the one you gave in your question above (the upper sum index is variable in the formula of your fle), so I think you have to clear things up for yourself first.
Anyway, the attached sheet may help as it shows much easiers ways to calculate your matrix K.