Problem converting C# to RDLC Expression

I have C# code which I need to put into an RDLC expression to calculate percentage. Please help me know how to do that. I have the query which fetches qty, price etc.,  but I do not have an idea on how to make this percentage possible.

select distinct Store_Number,Location,MIN(WkEnd_Date) WkEnd_Date,ItemNumber,MIN(Qty) [Qty_Cw],MAX(Qty) [Qty_YTD],
MAX(WkEnd_Date) WkEnd_Date_Max,
SellingPrice,MIN(total_price) total_price,MIN(total_retail_price) total_retail_price,RetailPrice from
(
 select PJ_RetStore_Sales_T.Store_Number, PJ_Location_M.Location, PJ_RetStore_Sales_T.WkEnd_Date,
 PJ_RetStore_Sales_T.ItemNumber,SUM(PJ_RetStore_Sales_T.Qty) as Qty, PJ_Item_M.SellingPrice,
 sum(PJ_RetStore_Sales_T.Qty)*PJ_Item_M.SellingPrice as total_price,
 sum(PJ_RetStore_Sales_T.Qty)*PJ_Item_M.RetailPrice as total_retail_price,
 PJ_Item_M.RetailPrice
 from PJ_RetStore_Sales_T, PJ_Location_M , PJ_Item_M
 where PJ_RetStore_Sales_T.Store_Number = PJ_Location_M.Store_Number
 and PJ_RetStore_Sales_T.ItemNumber = PJ_Item_M.ItemNumber
 and PJ_Item_M.variation = 'Std' and WkEnd_Date >= '2014-06-06' and WkEnd_Date <= '2015-06-06'
 and PJ_RetStore_Sales_T.ItemNumber = 'C123'
 group by PJ_RetStore_Sales_T.Store_Number, PJ_Location_M.Location,
 PJ_RetStore_Sales_T.WkEnd_Date, PJ_RetStore_Sales_T.ItemNumber,
 PJ_Item_M.SellingPrice, PJ_Item_M.RetailPrice
 --order by PJ_RetStore_Sales_T.Store_Number, PJ_RetStore_Sales_T.WkEnd_Date
 ) t
 group by Store_Number,Location,ItemNumber,SellingPrice,RetailPrice 

//Curr Year Curr Week Qty
			If (CDate(WkEnd_Date) >= CY_CW_FrmDt) and (CDate(WkEnd_Date) <= CY_ToDate) then
				CY_CW_RtlVal = CY_CW_RtlVal + round((CSng(Qty) * CSng(Retail_Price)),2)
				T_CY_CW_RtlVal = T_CY_CW_RtlVal + round((CSng(Qty) * CSng(Retail_Price)),2)
			End If

			//Last Year Curr Week Qty
			If (CDate(WkEnd_Date) >= LY_CW_FrmDt) and (CDate(WkEnd_Date) <= LY_ToDate) then
				LY_CW_RtlVal = LY_CW_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
				T_LY_CW_RtlVal = T_LY_CW_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
			End If

			//Curr Year YTD Qty
			If (CDate(WkEnd_Date) >= CY_FromDate) and (CDate(WkEnd_Date) <= CY_ToDate) then
				CY_YTD_RtlVal = CY_YTD_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
				T_CY_YTD_RtlVal = T_CY_YTD_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
			End If

			//Last Year YTD Qty
			If (CDate(WkEnd_Date) >= LY_FromDate) and (CDate(WkEnd_Date) <= LY_ToDate) then
				LY_YTD_RtlVal = LY_YTD_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
				T_LY_YTD_RtlVal = T_LY_YTD_RtlVal + round((CSng(ResRep(Qty)) * CSng(Retail_Price)),2)
			End If

bT_Week_Perc = ((T_CY_CW_RtlVal / T_LY_CW_RtlVal) - 1) * 100
    bT_YTD_Perc = ((T_CY_YTD_RtlVal / T_LY_YTD_RtlVal) - 1) * 100

 I need to show the bT_Week_Perc and bT_YTD_Perc as separate columns in my RDLC. I need this as Soon as possible please help.