Question about the mechanics of scale moding

[Huzurdaddi]

I have a question about

#luckevents
#turnmoilevents

If you set
#luckevents 20
#turnmoilevents 10

then if you pick turmoil-3 and luck-3 given the usual percentage of a random event is P then the chance for a random event is:

a) P * 1.6 * 1.3
b) P * ( 1 + .6 + .3 )
c) P + .6 + .3

I'm *sure* it is not c, but I might as well add it.

Oh and what is P I can not seem to find the modding command for it