Let j be the cost of the jellyfish and e be the cost of the eel. We know that j + e = $200 and e = 9j.
Substituting the second equation into the first equation, we get j + 9j = $200
Combining like terms, we get 10j = $200
Dividing both sides by 10, we get j = $20
Substituting this value back into e = 9j, we get e = 9 * $20 = $<<9*20=180>>180
#### 180