Replying to the prime minister's letter of Friday, she said: "I had already indicated in my letter dated July 7, that while the state PSUs (public sector undertakings) would be prepared to buy the entire 5 percent of the equity of NlC proposed to be disinvested, since 6.44 percent of equity is already with the public, it would be adequate if only 3.56 percent is offered for sale to meet the regulatory norm of 10 percent public holding."