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

### Instruction:
James needs 40 fish to make one sushi roll. He goes to the market and buys 400 fish, but later finds out that 20% of the fish have gone bad and cannot be used. How many sushi rolls did James make with the remaining fish?

### Response:
If James bought 400 fish, but 20% were bad, he could only use 400 * (1-20%) = 320 fish for his sushi rolls.
If you need 40 fish to make one roll, 320 fish will make 320/40 = <<320/40=8>>8 sushi rolls
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