Since 1 dozen is equal to 12, then Samuel has 2 x 12 = <<24=24>>24 doughnuts.
While Cathy has 3 x 12 = <<3*12=36>>36.
They both have 24 + 36 = <<24+36=60>>60 doughnuts together.
There are 8 friends + 1 (Samuel) + 1 (Cathy) = <<8+1+1=10>>10 that will share the doughnuts.
Thus, each of them will get 60/10 = <<60/10=6>>6 doughnuts.
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