Percentage doesnt work properly

The function "%" doesnt work the way it should. I think this is a bug, I hope you can fix it soon. I like the look of the app because it reminds me the default calculator that ios has on the ipod touch version of ios, but the percentage function is important to me so please fix that. Also, Id like bigger numbers on the buttons, or at least the possibility to set the font size. Thanks.

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