Righetti Homes, a custom home builder in Arizona, is currently offering three models in a newly developed residential neighborhood in Scottsdale. The accompanying Specs worksheet includes the information about the three models, including selling prices, material costs, labor costs, buyer incentives $($percent of the selling price$),$ and average buyer upgrades $($percent of the selling price$).$ Righetti Homes plans to build $50$ homes in the neighborhood, and it would like to estimate its total sales and profits in the new residential neighborhood.