At one time, the Texas Junior college Teachers asscosiation annual conference was held in Austin. At that time a taxi ride in austin was $1.25 for the first 1/5 of a mile and $.025 for each additional mile.

If the distance from one of the convention hotel to the airport is 7.5 miles how much will it cost to take a taxi from the hotel to the airport?

7.5 miles = 0.2 miles + (7.5 - 0.2) miles = 0.2 miles + 7.3 miles

So, you pay $1.25 for the first 1/5 miles, plus for the additional 7.3 miles, which gives 0.25*7.3 = $1.825 = $1.83. Add both to get the total cost.