hi, i have a quick question. i am using the round() function to show the item price on my shopping cart in php, but it omits the zero

for example:

$price = 1.51;
$tax = .19
$total = $price + $tax; // $1.60

echo $total;

is display this: 1.6

i want it to show 1.60 not 1.6

how do i do this?