John's weight bench can support 1000 pounds.  He wants to make sure to stay 20% under that weight for safety.  If he weighs 250 pounds how much weight can he put on the bar?
How much does John want to stay under the max? ** He wants to stay 1000*.2=<<1000*.2=200>>200 pounds under the max
How much does John want to stay under the max? ** So he wants to stay under 1000-200=<<1000-200=800>>800 pounds
How much weight can John put on the bar? ** That means he can put 800-250=<<800-250=550>>550 pounds on the bar
#### 550