How to get money when giving to science 100% ?

[AAjus[LTU]]

I wonder how is it possible to give 100% of commerce to the science and still get +21 gold every turn. As it is seen in this screenshot:
http://www.civfanatics.com/gallery/files/8/1/9/2/9/HoldTheLine0000_original.jpg

 

[ParadigmShifter]

Merchant specialists and/or holy shrines. BtS has corporations too which might just give gold instead of commerce but I haven't got BtS so I don't know the details.

Merchants and shrines give gold not commerce. Commerce is multiplied by the slider but gold is not (but gold is the result of commerce multiplied by the slider).

EDIT: Also, priest specialists, and merchant and priest super specialists also give gold. The spiral minaret also gives gold for each building of the state religion.

 

[AAjus[LTU]]

oh, I could figure it out myself. thank you for your answer

 

[axident]

Also Spiral Minaret and resource trades for gold. As mentioned above, yes corps also give gold in the HQ city.