For a blue monster summoning spell, we can get research bonus from retorts:
specialist 12%,
Omniscient + blue 8 books (16%+3.5%*7 = 39.5%)
Conjurer 25%
I expect to have 76.5% (12%+39.5%+25%) reduction.
Or perhaps I can expect them to be multiplied, and the reduction should be:
1 - (1-12%) * (1-39.5%) * (1-25%) = 1-40.5% = 59.5%
Or even counting research pt boost of:
100%+12%+25%+39.5%=176.5% (addition formula)
112%*125%*139.5% = 195.3% (multiplication formula)
But for a Nagas spell research, I see:
Research cost = 320, the same as normal cost
Research merely 3pt boost when I throw in 10 pt, i.e. I got total 13pt for 10pt invest.
So, what is the real formula?
specialist 12%,
Omniscient + blue 8 books (16%+3.5%*7 = 39.5%)
Conjurer 25%
I expect to have 76.5% (12%+39.5%+25%) reduction.
Or perhaps I can expect them to be multiplied, and the reduction should be:
1 - (1-12%) * (1-39.5%) * (1-25%) = 1-40.5% = 59.5%
Or even counting research pt boost of:
100%+12%+25%+39.5%=176.5% (addition formula)
112%*125%*139.5% = 195.3% (multiplication formula)
But for a Nagas spell research, I see:
Research cost = 320, the same as normal cost
Research merely 3pt boost when I throw in 10 pt, i.e. I got total 13pt for 10pt invest.
So, what is the real formula?