In Math and Arithmetic. Two million five hundred thousand = 2,500,000   Standard Form = 2.5 x 106   It is 106 because the decimal was moved six places over. Angela Pule.
When I recently took delivery of a new car, it had 36 miles on the clock. I was fine with this. However anything more than 60 would have annoyed me. I've had one with 7 miles and one with 17 miles.
The average car is driven about 10,000 miles a year. This means that most cars have about 15 years worth of mileage. This fact allows us to combine mileage life and years of life into a single unit of measurement. In other words, a typical car has 15 year of life and 15 mileage units of 10,000 miles each. Thus, a brand new car has 30 units of life. As a car ages and is driven, these units are used up. If you divide the number of units left in a vehicle by its price, you have the cost per unit.