Add Zero's to make two decimals.

I have a trim function in which a text string and a monetary amount are

combined. The amount is derived by a calculation that rounds to two

decimals.

However, when the amount is a round figure, e.g. 5 or 5.1, I have found

no way of adding zero's to make them read 5.00 or 5.10

Does anybody know how to do this?

Grateful for any suggestions.