James pays $1000 for advertising.  It brought 100 customers to his site and 80% of those bought something at the store that cost $25.  How much profit does he gain from the ad?
How many customers bought something? ** 100*.8=<<100*.8=80>>80 customers bought something
How much were the customers worth? ** That means they were worth 80*25=$<<80*25=2000>>2000
How much did he gain from the ad? ** So he gained 2000-1000=$<<2000-1000=1000>>1000 from the ad
#### 1000