Visualizing impressions with a doughnut chart

From the list of items for the dashboard requested by the marketing director:

A chart to show the percent of impressions by source

This first chart in the dashboard will help visualize the difference in visibility between Google and Bing, which can be done using either a pie chart or a doughnut chart. The marketing director will want the charts to look clean and neat, so you will use the doughnut chart instead of the pie chart because it is a bit more visually appealing.