Dealing with Pecentage Calculations in Reports

Can anyone help please? Report Gross Grand Total and Sales tax Total are off
by a penny or 2

The amounts are being generated by the
sum expression below that calculate unitprice and salestax so users only
need to put the unit price of the item in the Order Details Table. The
line
totals in the report seem to calculate and display properly but the grand
totals are off by a few pennies. The data type for unit price and sales tax
rate is set to currency and 2 decimal places and will not allow input mask
changes. The Main Report Query gross Order Total shows a number like
667.3768 Thanks



----Order Details Table----
OrderDetailID - Primary Key - AutoNumber - Long Integer
OrderID - Text
ProductID - Text
Quantity - Number - Double - Decimal 0
UnitPrice - Currency - Format Currency - Decimal 2
CCSPrice - Currency - Format Currency - Decimal 2
Discount - Currency - Format Currency - Decimal 2


----Order Table----
OrderID - Text
CustomerID - Number - Long Integer - Decimal Auto
EmployeeID - Long Integer - Decimal Auto
OrderDate - Date/Time - Short Date
PurchaseOrderNumber - Text
ShipName - Text
ShipAddress - Text
ShipCity - Text
ShipStateOfProvince - Text
ShipPostalCode - Text
ShipCountry - Text
ShipPhoneNumber - Text
ShipDate - Date/Time - Short Date
ShippingmethodID - Number - Long Integer 0 Deciaml Auto
FreightCharge - Currency - Decimal 2
CityTaxRate - Currency - Format Percent - Deciaml 2 - Default value 0
StateTaxRate - Currency - Format Percent - Deciaml 2 - Default value 0
SalesTaxRate - Currency - Format Percent - Deciaml 2 - Default value 0
ARDetailID - AutoNumber - Long Integer

----Main Report Query----
SELECT DISTINCTROW Orders.OrderID, Orders.CustomerID,
Sum(CCur([Quantity]*[UnitPrice])*100)/100+Sum(CCur([Quantity]*[UnitPrice]*[SalesTaxRate])*100)/100+First(CCur([FreightCharge])*100)/100
AS [Gross Order Total], Sum(CCur([Quantity]*[UnitPrice])*100)/100 AS
[Net
Order Total], Sum(CCur([Quantity]*[UnitPrice]*[SalesTaxRate])*100)/100
AS
[Sales Tax Total], Orders.FreightCharge,
Sum(CCur([Quantity]*[UnitPrice]*[CityTaxRate])*100)/100 AS [City Tax
Total],
Sum(CCur([Quantity]*[UnitPrice]*[StateTaxRate])*100)/100 AS [State Tax
Total], Sum(CCur([Quantity]*[CCSPrice]-[Discount])*100)/100 AS
CCSPricing,
Orders.OrderDate,
Sum(CCur([Quantity]*[UnitPrice])*100)/100-Sum(CCur([Quantity]*[CCSPrice])*100)/100+Sum(CCur([Discount])*100)/100
AS Profit
FROM Orders LEFT JOIN [Order Details] ON Orders.OrderID = [Order
Details].OrderID
GROUP BY Orders.OrderID, Orders.CustomerID, Orders.FreightCharge,
Orders.OrderDate
HAVING (((Orders.OrderDate)=[forms]![Report Date Range]![Beginning
Order
Date] And (Orders.OrderDate)=[forms]![Report Date Range]![Ending Order
Date]));

In the Main Report Query, each record for Gross Order Total is showing 4
numbers to the right of the decimal.


----Main Report----
Record Source - Main Report Query
Filter on - No
Order By On - No
Sorting and Grouping - OrderDate - Ascending
Group Header - No
Group Footer - No
Group on Each Value
Group Interval - 1
Keep Together No

In Report Detail I have Gross Order Total and Sales Tax Total which
seem to
calculate fine...I think. The calculations are incorrect when I Sum
those 2
in the Report footer. This is where I am seeing it off by 1 or 2
pennies.
=Sum([Gross Order Total]) - Running Sum - No
=Sum([Sales Tax Total]) - Running Sum - No