I have to evaluate a marketing case and one of the questions is asking how large is the market in unit terms?

The case provides units data in percentage of segment growth, geographic growth and number of units sold in a year (but it seems such a low number compared to the turnover number).

For example, the company was estimated to hold 8% (units) of the video market worldwide and 9% of the data market.

I have sure how to answer how large is the market in unit terms with various units and data that units measure within the case.