Combining a bar graph and line graph with 2 sets of data

[lynzlou]

I'm sure this is an easy fix, but maybe my head cold is affecting my brain or something cause I can not figure it out! My boss wants a graph that shows:
1 - how much steel we purchased each month from each of our supplies (3 different ones) in a bar graph
2 - the average cost of steel purchased from each supplier each month in a line graph within the bar graph

is that possible? I attached the worksheet that I put 3 months worth of data into, trying to figure this out!

anyone have step by step instructions for excel 2013?