Question 5463
The question needs to be reworded because it ask What percent of the student wear rings?  Do you mean one ring or two rings?  I hope the following helps you.  

1,200 - 4% = 48 students wear - one ring
1,152 - 1/2 - 576 students wear two rings
The remainder 576 wear no rings.

To check your answer 

48 + 576 + 576 = 1,200 students