Respuesta :
Answer:
360 people
Step-by-step explanation:
   x = 0.8x + 72      Subtract 0.8x on both sides
0.2x = 72 Â Â Â Â Â Â Â Â Â Divide 0.2 on both sides
   x = 360
Answer:
The Answer is C. 360
360 People Became Members of that website that Month
Hope This Helps!