A professor considers rideshare options for their campus commute and learns that the average per-mile cost of rideshare is $2. Unfortunately, they would need to buy one of those fancy smartphones at an annual cost of $500. Their alternative to being a passenger on the way to campus is driving, and they learn they could purchase a reliable used F150 for $20,000. How many miles would they have to drive to be indifferent between rideshare services and owning their own vehicle to commute to campus? O a. 10,000 miles O b. 9,750 miles O c. 9,500 miles O d. 10,250 miles

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