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?
If James bought 400 fish, the number of fish that were bad is 20/100*400 = <<20/100*400=80>>80
The remaining fish that he used to make the sushi rolls is 400-80 = <<400-80=320>>320
If 40 fish are required to make one sushi roll, 320 fish will make 320/40 = <<320/40=8>>8 sushi rolls
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