Cost Roll Up for Make Item using Process Manufacturing

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Hello Friends

I am trying to understand that how "Quantity Used" is showing in roll up cost based on work definition.

I have a work definition for Process Mfg with Batch Qty as 900, Costing Batch Size is 1, Output Qty is 840 and component qty is 16.6 with Item yield as 1.

After cost roll up the qty column shows value as 0.017910 which I am not understanding how that is calculated?

I was expecting 16.6/900 (Batch Qty)=0.018444444.

Please help to understand how system is calculating Qty on Cost roll up in this scenario.

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