New Delhi, May 16 -- For a man looking to invest nearly Rs.600 crore in his multiplex venture NY Cinemas Llp over the next five years, Ajay Devgn appears unusually calm. Dressed in a dark blue T-shirt and brown trousers, the 50-year-old actor looks amused by the title track of his popular action film Singham blaring out in the conference room meant for media interaction to discuss his latest project. To begin with, Devgn plans to open nearly 250 screens starting from the northern and western parts of India. The first is due for launch this June in Madhya Pradesh's Ratlam....