Pls help me with this question!!!

Answer:
6.25
Step-by-step explanation:
100-50=50
50 percent of 50 is 25
50-25=25
50 percent of 25 is 12.5
25-12.5=12.5
50 percent of 12.5 is 6.25
i did it 4 times so 6.25 is the answer