Plz help me, buoyant force problem.?

body of weight 100N, 3/4 of its volume float on water,then weight of water displaced =?. In the test i said 3/4 above water, then 1/4 immersed. Then volume immersed=volume displaced. Then weight of water displaced equals 25 but i got it wrong. I dunno whats the answer, another try was fg=fb . Then 100=1000x10x1/4VOLt. Then volume total equals 0.004 and volume displace equals 1x10^-3. Then density =m/v. Then 1000=m/10^-3. Then m =1, thats wrong though bec its multiple choice and the answers i can pick are (200, 25, 100, 75, 50) plz answer with logic explanation and rules explanation