In early 1990, Boeing Co. decided to gamble $4 billion to build a new long-distance, 350-seat wide-body airplane called the Boeing 777. The price tag for the 777, scheduled for delivery beginning in 1995, is about $120 million apiece. Assume that Boeings $4 billion investment is made at the rate of $800 million a year for the years 1990 through 1994 and that the present value of the tax write-off associated with these costs is $750 million. Based on estimated annual fixed costs of $100 million, variable production costs of $90 million apiece, a marginal corporate tax rate of 34 percent and a discount rate of 14 percent, what is the break-even quantity of annual unit sales over the Boeing 777s projected 15-year life? Assume that all cash inflows and outflows occur at the end of the year.