How do you unlock the door in the Casino that takes grams?

First, turn on the power to the room by flipping the near by switch. Second, go to the fountain and read to book. Third, on the other side of the fountain ther is a switch, press it and the fish inside will transform from the t- abyss virus. Fourth, kill all of the mutated fish and search with your scanner afterward. Fifth, with the collected coin, walk around the room playing all of the slot machines 1 time until you receive a bundle of coins. Last return to the door and inspect the tray the woman is holding, I think it takes 3 bronze 1 or 2 silver and 1 gold to reach 107 grams.