John invests in a bank and gets 10% simple interest.  He invests $1000.  How much money does he have after 3 years?
He gets 1000*.1=$<<1000*.1=100>>100 a year
So after 3 years, he gets 100*3=$<<100*3=300>>300
So he has 300+1000=$<<300+1000=1300>>1300
#### 1300