Reverse Maximisation

Abdullah has invented a machine for converting money. When $X$ units of money are inserted into this machine, it produces $\mathrm{Reverse}\,(X)$ units of money. where $\mathrm{Reverse}\,(X)$ denotes the decimal number obtained by reversing the decimal representation of $X$ (without leading zeroes). For example: - $\mathrm{Reverse}\,(123) = 321$, since the reverse of "123" is "321" - $\mathrm{Reve