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?
Let’s work this out in a step by step way to be sure we have the right answer.
800
It cost 10 - 2 = $8 to replace each movie.

So it would cost 8 * 100 = $800 to replace everything.

.

The answer: 800