Merge & Edit Excel Data.

Hello, I have 3 excel files (attached to project) that I need merged and modified. Ad Network [login to view URL] - Contains cost stats from advertising network Ad Network [login to view URL] - Contains cost stats from advertising network (Fewer Records) [login to view URL] - Contains Revenue stats from advertiser Basically the first 2 files are what the ad network is reporting for stats, and the 3rd file is what our ad server is reporting for stats. Currently they are mismatched and we want to merge them and get a better idea on which ad zones are profitable and which ones are not using accurate data. Task... Step 1) Merge data for each "Source ID" from Ad Network [login to view URL] and Ad Network [login to view URL] into one new data file. For example line 2 in Ad Network [login to view URL] contains 13789343 for Source ID and in Ad Network [login to view URL] this is contained in line # 3. So in the new data file you would take combine the impressions and cost for that "Source ID" into a new line. So for Source ID: 13789343 the new impressions could would be 46,605 and the new cost would be $748.40 because we simply combined to the two identical records into the 3rd file. As you can see Ad Network [login to view URL] only contains 128 records while Ad Network [login to view URL] contains 7,579 records. Step 2) Now once we have the merged data, were going to merge it with the data from [login to view URL] and update the records. Remember in Step 1 we worked with Source ID # 13789343 and if you look in [login to view URL] you will find this record on line 2. We will now update the impressions and cost values with the correct values we determined in Step 1. So we will replace the 27,945 impressions with 46,605 and replace the $851.11 cost with $748.40. Step 3) Once we merged the data in step 1, then updated [login to view URL] with the new values we are simply going to update the Profit and ROI fields with the updated totals. Going back to the Source ID 13789343 sample we are going to update the profit field to -56.15 (Revenue 692.25 Minus Cost $748.40) and then update the ROI (Return On Investment) to -7.5% Note: ROI is calculated by taking profit divided by cost multiple by 100 to get the percentage. So for example on Source ID: 13789343 it would be -56.15 / $748.40 x 100 = -7.5% End Result: You provide me with an excel sheet so I can accurately and easily identify which Source IDs are profitable or losing money. Note: I will be selecting a freelancer that can complete this task quickly (today)