Write a program reads the city names and respective gas prices into 2 single-subscripted arrays in your program - one of type string, the other of type double. (We would call these "parallel arrays" - each corresponding location shows the city name and gas price for each city). Your program should do the following:
a. Find and display the average gas price.
b. Find and display the highest gas price, along with a list of all cities at that gas price.
c. Find and display the lowest gas price, along with a list of all cities at that gas price.