The chickens cost $80 because 4 x 20 = <<4*20=80>>80
His chickens produce a dozen eggs a week because 4 x 3 = <<4*3=12>>12
Each week that he has chickens is $1 cheaper than buying eggs because 2 - 1 = <<2-1=1>>1
After 80 weeks his chickens will be paid off because 80 / 1 = <<80/1=80>>80
After 81 weeks the chickens will be cheaper than buying eggs because 80 + 1 = <<80+1=81>>81
#### 81