A portrait studio specializes in family portraits. They offer a Basic package that costs $25 to produce and an Heirloom package that costs $40 to produce. To have a successful week, the studio must sell at least 50 Basic packages at $30 each and at least 34 Heirloom packages at $75 each, with total revenue of at least $4500. How many of each package should they sell in order to minimize their costs?