How do I perform percentage wise calculation in reports?

I am trying to build a report of the following format:

Some Column A | Some Column B | Some Column C | Percentage Allocation
-------------------------------------------------------------
Value N       | Value B       | 100           | 10%
Value C       | Value S       | 200           | 20%
Value D       | Value Y       | 300           | 30%
Value A       | Value X       | 400           | 40%
-------------------------------------------------------------
                              | 1000          |

The Percentage_Allocation column should be calculated like this: 100/1000 * 100

I have created two variables:

GRAND_TOTAL defined as the sum of the values in Column C and PERCENT_ALLOCATION defined as Field value of Column C divided by GRAND_TOTAL

The output I get is:

Some Column A | Some Column B | Some Column C | Percentage Allocation
-------------------------------------------------------------
Value N       | Value B       | 100           | 100%
Value C       | Value S       | 200           | 66%
Value D       | Value Y       | 300           | 50%
Value A       | Value X       | 400           | 40%
-------------------------------------------------------------
                              | 1000          |

I understand that this is happening because the value of PERCENT_ALLOCATION is being calculated as and when a new row is created on the report. But I want it to be calculated only when all the details have been loaded. Maybe this is not possible? I don't know, is there something I can do to achieve my target output?

UPDATE:

So I've figured out that there's a property called Evaluation Time which can help me decide when the column PERCENT_ALLOCATION should be calculated. I have set it to Report so that the value of GRAND_TOTAL takes the sum of all the values in Column C. But now I find that PERCENT_ALLOCATION is being calculated using the last value in Column C only. So my report looks like this:

Some Column A | Some Column B | Some Column C | Percentage Allocation
-------------------------------------------------------------
Value N       | Value B       | 100           | 40%
Value C       | Value S       | 200           | 40%
Value D       | Value Y       | 300           | 40%
Value A       | Value X       | 400           | 40%
-------------------------------------------------------------
                              | 1000          |

Thanks.

Best How To :

Do not calculate the percent in a variable. Perform the calculation in a Text Field in the report. Use the field value of Some Column C and divide it by the GRAND_TOTAL variable.

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