When he gave Rodney 2/5 of the bunnies, he gave away 2/5*30 = <<2/5*30=12>>12 bunnies.
He remained with 30-12 = <<30-12=18>>18 bunnies.
When the bunnies gave birth to two kittens each, the total number of kittens born is 18*2 = <<18*2=36>>36.
In total, Marlon now has 36+18 = <<36+18=54>>54 bunnies
#### 54