As show: Total = Qty + PurchPrice, Subtotal = Sum of the Total column, tax, and Purchase Order Total = Subtotal + Tax. Dynamics Ax report from 2012 R2 "PurchPurchaseOrderReport"

Hi, I'm new in Microsoft Dynamics Ax 2012 R2 tool, Visual Studio 2010 and I'm designing a report with "PurchPurchaseOrderReport". my question to the forum is:

. 1 - As I show in the report the total sum of the "Qty" and "PurchPrice" fields: mathematically would be: Total = Qty + PurchPrice

2 - As I show in the footer of the report, the sum of the "Total" column.:

Subtotal = Sum of Column Total

. 3 - As I show in the footer of the tax report.

. 4 - As I show in the footer of the report the total purchase order: mathematically serious: Total purchase order = Subtotal + Tax