Challenge 26 - Calculating Sales Performance

Calculating Sales Performance

Level: Easy

Description: You work for a company that sells two products: Product A and Product B. As a data analyst, you want to calculate how sales increased or decreased for both products over a period of 12 months, on a monthly basis. In the end, you want to have a table with columns indicating the increase/decrease percentages of sales per month, as in the example below.

Month | Percentage_Sales_Product A | Percentage_Sales_Product B

February         | 45 %                                        | 100%

March         | 78%                                         | -87%