John decides to replace all his VHS with DVDs.  He can trade in his VHS for $2 each and then buy the DVDs for $10 each.  If he has 100 movies, how much does it cost to replace his movies?
It cost 10-2=$<<10-2=8>>8 to replace each movie
So it would cost 8*100=$<<8*100=800>>800 to replace everything
#### 800