Answer:
Real GDP increases while nominal GDP decreases
Explanation:
year 1: 10,000 MP3 players were produced at $100 each ⇒
year 2: 12,000 MP3 players were produced at $80 each ⇒
real GDP year 2 increases from $1 million to $1.2 million
nominal GDP year 2 decreases from $1 million to $960,000