How to keep correct decimal?

I keep the info in database as INT UNSIGNED

I have this simple function

function getPrice ($price) {

if (!$price)
		return 'FREE';
	else
		return 'USD'.$price/100;
}

That works fine, however if the last digit is zero such as 990 it will return 9.9

What should I do for it to return 9.90?

Thanks

You can use [man]sprintf/man or [man]money_format/man

money_format does not work with windows servers.
how would I do that sprint_f?

return 'USD' . sprintf("%.2f", $price / 100);

thank you

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