"Microsoft had not released any sales figures for Windows 8 other than saying the company sold 4 million upgrade licenses of the operating system to those with previous versions of Windows during the first three days it was available."
That's 10% of the total in the first three days to existing users.
If a month has 30 days then that's also 10% of the time period, or another way of saying it is that sales remained constant over that initial time frame.
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"Microsoft had not released any sales figures for Windows 8 other than saying the company sold 4 million upgrade licenses of the operating system to those with previous versions of Windows during the first three days it was available."
That's 10% of the total in the first three days to existing users.
Including myself.
If a month has 30 days then that's also 10% of the time period, or another way of saying it is that sales remained constant over that initial time frame.