This is linear programming

Johnson's, a Los Angeles, CA, clothing manufacturer that produces men's shirts and pajamas, has two primary resources available: sewing machine time and cutting machine time. Over the next month, owner Andrew Johnson can schedule up to 280 hours of work on sewing machines and up to 450 of work on cutting machines. Each shirt produced required 1.00 hours of sewing time and 1.50 hours of cutting time. Producing each pair of pajamas required 0.75 hours of sewing time and 2 hours of cutting time. Each shirt produced will yield a $4 contribution to profit, and each pair of pajamas will yield a $3 contribution to profit. Solve the problem using the graphical and corner-point method. Optimal solution = 280 shirts, 0 pajamas