The functions f(x) and g(x) in the table below show Jane's and Mariah's savings respectively, in dollars, after x years. Some values are missing in the table.


x(years) 1 2 3
f(x) = 2x
Jane's savings in dollars 2 4
g(x) = 2x
Mariah's savings in dollars 2 4


Which statement best describes Jane's and Mariah's savings in the long run?
Jane will save more than Mariah.
Mariah will save more than Jane.
The savings will increase by the same factor for both.
The savings will increase by the same percentage for both.