Evan inc. announces a cash purchase of 67% of the common stock in Tanner corporation. Prior to the purchase, Evan inc. held no share in Tanner Corporation. Tanner corporation is unlevered. Right before the acquisition announcement, the total value of equity in Tanner is $640 Million. As part of the acquisition, Evan offers to pay each stock purchased a 30% premium on the pre-merger value of Tanner. Although not a 100% purchase, the purchase will generate synergies. For the purchase to make economic sense for Evan, what is the minimum present value of the total synergies developed through the merger that justifies Evans investment?