[SOLVED] Rounding Monetary Value Issue

[dlebowski]

I need assistance with these two pieces of code below.  My calculations are off when a dollar amount is entered. 

 

 

First Part:

$value1=1;

$BuyerCashPrem = ($value1/100);
$CashPaid = (($cash) * $BuyerCashPrem);

$sum=99;
$absenteebid=1;
$taxtotal=1;
$cash=0;
$CashPaid=0;
$BuyerCashPrem=.01;

$grandtotal = (($sum + $absenteebid + $taxtotal)-((($cash - $CashPaid))));
$cashprem=($grandtotal * $BuyerCashPrem);

<? echo "$cashprem";?>

VALUE DISPLAYED=1.01

 

This is correct!

 

Second Part:

$grandtotal = ($sum + $absenteebid + $taxtotal + $cashprem);
$AllPaymentTotal = (($cash)-($CashPaid));
$amountdue = ($grandtotal - $AllPaymentTotal);

print $amountdue;

VALUE DISPLAYED=102.01

 

Now, if my customer pays 102.01, that should take care of the balance.  It doesn't.  It actually makes "$cashprem=0.00010099999999994" and "$amountdue=0.010200999999995"  I have spent hours upon house using "round" and "number_format" and I cannot get it to be correct.  It is always off by at least .01.  Can anyone help on this.  If I didn't provide enough information, please let me know and I will get you more.  Thanks in advance.

 

Ryan