I want to know the answer to the following question:
Madonna generated how much in sales in the first 10 years of her career?
All the background I'm provided with is that "London Business School academics called her a "dynamic entrepreneur" worth copying; they identified her vision of success, her understanding of the music industry, her ability to recognize her own performance limits (and thus bring in help), her willingness to work hard and her ability to adapt as the keys to her commercial success.". Is that enough to answer the question?