Miranda Chavez is a Lyft driver. Rapidly rising gas prices has Miranda considering the purchase of a new hybrid. She gathered the information below to help her make the decision to keep her old car or replace it with a new Honda Insight (the hybrid version of the car she now owns). Ignore tax and time value of money.

	Old Honda Civic	Honda Insight (Hybrid)
Original Cost	$25,000	$30,000
Accumulated Depreciation	$6,000
Resale Value	$21,000
Annual Maintenance & Repairs	$525	$530
Insurance	$1,605	$1,753
Average Miles Driven	50,000	50,000
Weighted Avg Miles/Gallon	30	55
Average Cost per Gallon	$4.32	$4.32
Remaining Years of Useful Life	5	5

a. Should Miranda buy the more fuel-efficient Honda Insight? Why or why not? [To earn full or partial credit show all of your work.]

b. Now assume that the Years of Useful Life is not provided in the problem. There is a cutoff for years of useful life that makes the total costs over the life of Honda Civic equal to that of Honda insight. What is that cutoff?