You can use the format function on the query field, but I think it would be easier if you just formatted the control in the report so as to show only 2 decimal places by setting this in the property sheet in design view. If this propagates to other things, then you can/should set the number of places in the table field itself. Did you set the table field to be Currency data type?
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.