"My grandfather spent 5% of sales on advertising, my father spent 5% of sales on advertising, it has worked for both so I will spend 5% of sales on advertising" is an example of knowing by:

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The Answer of "My grandfather spent 5% of sales on advertising, my father spent 5% of sales on advertising, it has worked for both so I will spend 5% of sales on advertising" is an example of knowing by:

"My Grandfather Spent 5% of Sales on Advertising, My Father