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I couldn't solve this one, so I think I'd have to go E.
St 1 nets me:
0 = c + mp - 50 0 = c + np - 60 c + mp - 50 = c + np - 60 mp = np - 10
So I'm at a dead end there, knowing Co. M bought 10 more printers.
St 2 repeats what I was able to get from St 1.
mp = np - 10
Both statements basically say the exact samething--there's still the matter of distributing the 50 sum of computers and printers (+ N's additional 10 printers). I didn't see a way to get to that breakdown with the info supplied.