Ensure that if new cities are added to the list of cities in Problem 9, the drop-down menu will include them.

Data from in problem 9

The file named Latitude.xlsx contains a formula to compute the distance between two cities using their latitude and longitude. The file also contains the latitude and longitude of various US cities. Set up a drop-down menu so that when you select a city in cell P2 and another city in cell Q2, the distance between the cities is computed in cell Q10.