U.S. generic drugmaker Perrigo said on Thursday it will invest $40 million in Israel over the next three years to expand its research and development and production of pharmaceuticals. As part of the investment, Perrigo plans to add another 100 employees to its two plants in Israel, it said. Perrigo had expanded its workforce in Israel by 40 percent over the past three years to about 900. In recent years, Perrigo has invested 280 million shekels ($72 million) plus $30 million a year for R&D.