Jane's chickens lay 10 chickens * 6 eggs = <<10*6=60>>60 eggs per week.
Jane's chickens lay 60 eggs / 12 = <<60/12=5>>5 dozen eggs per week.
Each week that Jane sells her eggs she can make 5 dozen * $2 = $<<5*2=10>>10 per week.
In two weeks Jane would make 2 * $10/week = $<<2*10=20>>20.
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