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Introduction
Reports with revenue in categories
Revenue in time periods for selected categories
Summary
17. Question 2

## Instruction

Very good! Let's move on to Question 2.

## Exercise

For each category, find the December 2016 revenue and show it alongside the ratio of that category's revenue to the total revenue for December 2016. Show the following columns: category_name, category_revenue, and total_revenue_ratio. Round the total_revenue_ratio to 2 decimal places.