Answer:
Extra earning of garage = $140 per day
Step-by-step explanation:
A parking garage has spaces for 70 cars and charges each driver $6 per day for parking.
By this charge parking garage earns 70×6 = $420 per day.
If the garage is full and garage owner charges $8 per day then total earning will be = 8×70 = $560
Therefore, extra earning of garage owner will be = $560 - $420 = $140 per day.