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?
How many fish were bad? ** If James bought 400 fish, the number of fish that were bad is 20/100*400 = <<20/100*400=80>>80
How many fish did James use? ** The remaining fish that he used to make the sushi rolls is 400-80 = <<400-80=320>>320
How many sushi rolls did James make? ** 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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