Banking problem

[Godhand]

I edited my cron_day file to make donators get more intrest but it didn't work or get any intrest the code is

 $db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(2/100)) where bankmoney>0");
$db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(7/100)) where bankmoney>0 AND donatordays>0");
$db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(2/100)) where bankmoney>0 AND donatordays>100");
$db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(2/100)) where bankmoney>0 AND donatordays>200");
$db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(2/100)) where bankmoney>0 AND donatordays>300");
$db->query("UPDATE users SET bankmoney=bankmoney+(bankmoney*(2/100)) where bankmoney>0 AND donatordays>400");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(14/100) where cybermoney>0 AND donatordays>0");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(8/100) where cybermoney>0");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(4/100) where cybermoney>0 AND donatordays>100");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(4/100) where cybermoney>0 AND donatordays>200");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(4/100) where cybermoney>0 AND donatordays>300");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(4/100) where cybermoney>0 AND donatordays>400");
$db->query("UPDATE users SET cybermoney=cybermoney+(cybermoney*(50/100) where cybermoney>0 AND donatordays>950"); 

There is no error message for this that I am aware of; it manually isn't working any suggestions are appreciated. I'm thinking it might be needing the

 $db->query($query8);

stuff but I'm not 100% sure. I'm going to test it though.