ANSWER
120
EXPLANATION
The car model has the following options:
• 5 exterior colors
,• 4 interior colors
,• 2 wheel choices
,• 3 sound system choices
Each choice is independent of the other - i.e. the interior color does not depend on the exterior color or the wheel choice. So,
[tex]5\cdot4\cdot2\cdot3=120[/tex]Hence, 120 unique cars can be formed.