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Bismuth83
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100 million (increase in the estimated number of users in Company Z from Year 1 to 9)/1.8 billion (increase in the estimated number of users across all of Holding Company A's web properties from Year 1 to 9), i.e., 1800 million = 0.055.. which then multiplied by 100 to make it into % format gives us 5.55....6 = ~5.6%

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hOW 5.6 ?
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1. The question asks us to analyze the graph and answer the following dropdowns.

2. Company Z increased from 0 to about 100 million, while Holding Company A went from 1 billion to 2.8 billion. The percentage is then equivalent to \(\frac{100000000 - 0}{2800000000 - 1000000000} * 100\% = \frac{100000000}{1800000000} * 100\% = \frac{100}{1800} * 100\% \approx 5.6\%\).

3. The total number of users between Companies X, Y, and Z is \(800 \ million + 180 \ million + 100 \ million = 1.08 \ billion\). Holding Company A has 2.8 billion users during year 9. So, the percentage is \(\frac{1.08 \ billion}{2.8 \ billion} * 100\% = \frac{1.08}{2.8} * 100\% \approx 38.6%\), which is between 30% and 50%.

4. Our answer will be: D1 - 5.6 and D2 - Between 30% and 50%.
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