Description of problem:
-----------------------
Inaccurate storage used costs are being reported in Chargeback reports.

Here's a table of the rates for Used CPU  USD/Hour/GB:
Range(start-finish)|Rate(fixed, variable)
--------------------------------
0.0 - Infinity       |0, 2.0

The 'Used Disk Storage' for one of my infra VMs(rhev) is 360 GB in a day.
It is actually 15 GB/hour for every hour on that day.
Going by this table,the rate is 2.0 USD/Hour/GB.The reported cost in the Chargeback report is $ $773,094,113,280.00.

Based on my calculation, the cost should be $720.

 Storage used cost = Used disk storage in GB/hour * storage rate per GB per hour
                   = 15 GB * $2.00 (/GB/hour) (for the 1st hour)+
                     15 GB * $2.00 (/GB/hour) (for the 2nd hour)+
                            ....
                            ....
                      15 GB * $2.00 (/GB/hour) (for the 24th hour)
                   = 720 $


                   
Version-Release number of selected component (if applicable):
-----------------------------------
5.6.2.0


How reproducible:
-----------------
Always


Steps to Reproduce:
-------------------
1.Enable C&U collection for a provider.
2.Assign the Storage rate from the issue description to Enterprise
3.Generate a Chargeback report for VMs based on this rate.

Actual results:
---------------
Incorrect storage used cost in Chargeback reports


Expected results:
------------------
Correct storage used cost in Chargeback reports


Additional info: