Hi, Do you mean 'volume', or do you really mean 'weight'? If you want to compare volumes, why are you mentioning prices? You need to give us a brief example to enable us to understand your question and the kind of answer you want.
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I think the comma after the $4,00 is mean't to indicate Billions as in $4 billion
When the question is saying by volume and has given the ratio of the prices we can derive the volume by dividing the Total Sales by Selling price.
So, if we assume the Selling Price of Drug B as x then because of the ratio given the Selling Price of Drug A becomes 2x
From that, the volume of Dr