Hello, can someone please help me with this. Thank you

A company makes four products that have the following characteristics: Product A sells for $75 but needs $20 of materials and $20 of labor to produce; Product B sells for $90 but needs $45 of materials and $20 of labor to produce; Product C sells for $110 but needs $50 of materials and $30 of labor to produce; Product D sells for $135 but needs $75 of materials and $40 of labor to produce. The processing requirements for each product on each of the four machines are shown in the table. Work centers W, X, Y, and Z are available for 40 hours per week and have no setup time when switching between products. Market demand is 50As,60Bs,70Cs, and 80 Ds per week. In the questions that follow, the traditional method refers to maximizing the contribution margin per unit for each product, and the bottleneck method refers to maximizing the contribution margin per minute at the bottleneck for each product. Which work center is the bottleneck operation? Work Center Z Work Center X Work Center Y Work Center W