Final answer:
Yun can reduce the file size of a chart in his business report by using the Compress Picture formatting option.
Step-by-step explanation:
To reduce the file size of a chart in a business report, Yun can use the Compress Picture formatting option. This option helps to decrease the file size by reducing the image's quality and resolution, while maintaining its appearance to a certain extent. By compressing the picture, unnecessary data is removed, resulting in a smaller file size without significant loss of visual information.
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