A venture capital investment group received a proposal from Wireless Solutions to produce a new smart phone. The variable cost per unit is estimated at $250, the sales price would be set at twice the VC/unit, fixed costs are estimated at $750,000, and the investors will put up the funds if the project is likely to have an operating income of $500,000 or more. What sales volume would be required in order to meet this profit goal?

Please include all calculations in your work. I am interested in how the problem is solved, not just the answer. Thank you!