Those numbers aren't that hard to get, and they are pretty good estimates, not "guesses".
But you don't even need to know the manufacture price or markup to know Apple is making a fucking blizzard of cash on these devices.
Here are the first two paragraphs from
Apple's own press release regarding their most recent quarterly results. Pretty much speaks for itself:
CUPERTINO, California—October 25, 2012—Apple today announced financial results for its fiscal 2012 fourth quarter ended September 29, 2012. The Company posted quarterly revenue of $36.0 billion and quarterly net profit of $8.2 billion, or $8.67 per diluted share. These results compare to revenue of $28.3 billion and net profit of $6.6 billion, or $7.05 per diluted share, in the year-ago quarter. Gross margin was 40.0 percent compared to 40.3 percent in the year-ago quarter. International sales accounted for 60 percent of the quarter’s revenue.
The Company sold 26.9 million iPhones in the quarter, representing 58 percent unit growth over the year-ago quarter. Apple sold 14.0 million iPads during the quarter, a 26 percent unit increase over the year-ago quarter. The Company sold 4.9 million Macs during the quarter, a 1 percent unit increase over the year-ago quarter. Apple sold 5.3 million iPods, a 19 percent unit decline from the year-ago quarter.