Hi,
From my experience, about this issue, I suggest you reading this article
http://www.windowsazure.com/en-us/support/understand-your-bill/
This article content:
This topic helps you with the following tasks when reading your bill.
•View or Download a Bill for Windows Azure
•Understand the Balances, Payments & Credits
•Understand the Current Charges
•Analyze Daily Usage Data
Hope it helps.
Regards
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