PHP - Mmorpg Help

im currently making a mmorpg i have a bank php script and i want donator intrest to be higher then normal players intrest
Code: [Select]
$interest= $ir['bankmoney']/100*2 ;
$interests=money_formatter($interest);
$balance=money_formatter($ir['bankmoney']);
^^^ i want that changed so if ($ir['donatordays'] > 0) donator days are higher then 0 then its 100*6 but normal intrest is 100*2
i can upload more of the bank code if needed but need help with this one as cant figure it out i am a noob and learning so if u have a snippet for it would
you be able to explain the code to make this work i do not expect to be spoonfed information but any help u could give would be great thanks