Management of a company is considering adopting a bonus system to increases production. One suggestion is to pay a bonus on the highest 5 percent of production based on past experience. Past records indicate that, on the average, 4000 units of a small assembly are produced during a week. The distribution of the weekly production is approximately normal with a standard deviation of 60 units. If the bonus is paid on the upper 5 percent of production, the bonus will be paid on how many units or more?