Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
An avant-garde sushi house sells jellyfish for a certain amount and eel for nine times that amount. If the combined cost of one order each kind of sushi is $200, how much does the eel cost?

### Response:
x = price of jellyfish
eel = 9x
x + 9x = $200
10x = $200
x = $20
eel = $180
#### 180