Ravi will rent a car for a day. The rental company offers two pricing options: Option A and Option B. For each pricing option, cost (in dollars) depends on miles driven, as shown below.

Part A. If Ravi drives the rental car 150 miles, which option costs less?
Answer: Option B
How much less does it cost than the other?
Answer: $30
D = 150 miles
Option A = $80
Option B = $50
Option A - Option B = $80 - $50 = $30
Part B. What number of miles driven do the two options cost the same?
Answer: 75 miles
If Ravi drives less than this distance, which option costs less?
Answer: Option A