I'm confused on the tables and annex c part of the nec.

Say I have the following....

All THHN in a schedule 80 pvc

#12 x10

#10 x5

#8 x3

Since I have over 2 wires in one conduit do I calculate the cross sectional area of the conduit at 40% and then add up cross sectional area of each wire and add them up and see what size the Will fit into?

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