This is just an average. And different areas pay different rates. RN's make about HALF more than LPN'S. For example, if LPN makes $30/hr, the RN makes $60/hr STARTING.
Just an estimate... Dont quote me.
But the good news is that you can become an RN with Associates in about 1 year if you are already an LPN. And pass the NCLEX of course.
Good Luck!