Answer: 41800, 7.6555%
Explanation:
The laptop sold for 45000 nu with a markup of 3200 nu.
This means the price of the laptop was (45000-3200) nu before the markup, or 41800 nu.
To find the mark-up percent, divide 3200 by 41800.
That will give you a percent of 7.6555
To double check that this is correct, multiply 41800 by 1.076555, and you'll get 45000 nu.