'If' condition with 'and'

In Bi publisher coding i did the following and is working fine:

XML:

 <TOTAL_DUE>220</TOTAL_DUE>

<?if:number(TOTAL_DUE)<0?>
No payment is due, your account is up to date
<?end if?>

i did the below code as well and its working fine:

XML:

  <PAYINFO_OBJ>0.0.0.1 /payinfo/cc 698975 0</PAYINFO_OBJ>

code:

<?xdofx:if instr(PAYINFO_OBJ,'cc')>0?>
PAYMENT IS DUE
<?end if?>

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NOW I WANT TO COMBINE BOTH THE STATEMENTS:

code:

<?if:((number(TOTAL_DUE)>0) AND xdofx:instr(PAYINFO_OBJ,'cc'))?>
PAYMENT IS DUE
<?end if?>

BUT ITS NOT WORKING, CAN ANY ONE HELP ME WITH THE SAME.