# Exercise: Show sales as a proportion of total for 3 dimensions

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The answer to the exercise will be included and explained if you attend the course listed below!

 Category ==> PowerPivot 2010  (26 exercises) Topic ==> FILTER and CALCULATE  (8 exercises) Level ==> Average difficulty Course ==> PowerPivot / Excel Power BI
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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To start, if you haven't already done so run the script in the above folder to generate the MAM database (not for commercial use or copying).

Create the following PowerPivot field list as a data model (or something similar to it):

You'll need to create two new calculated columns: one to give the year of each transaction, and one to give the amount (price times quantity).

The tables you'll need to import are tblAnimal, tblProduct, tblStore, tblTransaction, tblSpecies and tblPos.

Create and display a measure which gives the percentage contribution each cell (each filter context) makes to the total amount:

The reptile total for Arndale Centre - store A is 0.12% of the grand total, for example.

Select all of the species in the horizontal slicer, and scroll down to check that the grand total is now 100% for all stores, years and species (it should be).

Save this workbook as Clever PowerPivot, then close it down.

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