GLOBIS is one of the largest business schools in Japan. The author has taught at GLOBIS and its predecessors for over 25 years. He has felt too many businesspeople lost money because they could not think mathematically. So he wrote this book to encourage them to relearn the fundamentals of mathematics.
Advantages of using mathematics in business
1. Better decision making
2. Better prediction of the future
3. Less likely to be deceived by others
Being a business school teacher, he was able to write this "really useful" book on basic math. He carefully explains the stumbling points.