This module gives you Amazon.com stock price data to analyze. You will see how investments held over different periods of time performed. Here are the exercises and the data.
This one shows you how to use VLOOKUP:
This one shows you how to properly calculate growth in value in this data set:
And this one shows you one way to put two data series together on a graph:
There are many ways to work with graphs, and every version of Excel has the options in differnt places, but hopefully that demonstration gives you some idea of how to get two series on a graph.