How to fold the account with 100 pips per day and which lots to use?

[Alextrade3000]

Hello, What "mathematical calculus" to double the bill getting 100pips a day?
Example:

• $ 100 account with 100pps per day * " X " lots = $ 200
• $ 200 account with 100pps per day * " X " lots = $ 400
• $ 400 account with 100pips per day * " X " lots = $ 800
• $ 800 account with 100pips per day * " X " Lots = $ 1600
• $ 1600 account with 100pips a day * " X " Lots = $ 3200 ...

and so on...
I started testing by the initial values of the account did not work out