Help to solve question, am revising for exam

You want to build a goldfish tank and determine how much it will cost. Each tank has three dimensions: length, width and height. The cost of building the tank is simply the cost of the five panes of glass that comprise the tank (the tank top is not enclosed by glass). Glass cost exactly $0.02 for 1 square inch. Define a constant to store this value in your program. Your program should prompt the user for the length, width and height of the tank in inches. Then your program should calculate the cost of building the tank and output that to the screen.