HOW TO SUM A EXPRESSION

[kevderbeste]

Hi I have to expression salesT = sum(sales) and CostT ) = sum(cost), with this two expression, i calculated ratio = CostT/salesT. 

I need to know how to sum(ratio)  as a individual value, i need to have Ratio as a independent columno in order to sum data. 

Bellow my data example. 

fecha	sales	cost	Ratio
01/01/2019	102354	1200	0,0117
02/01/2019	1535310	1250	0,0008
03/01/2019	23029650	1280	0,0001
04/01/2019	345444750	1310	0,0000
05/01/2019	5181671250	1340	0,0000

Thanks! 

[amitchandak]

I am not sure I got it completely.

I think Ratio should be calculated like 

Ratio = calculate(divide(sum(sales),sum(cost))

It will calculate is at all level.

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Thanks.