I got this wrong please help

Case 1 Metal frames for kick scooters are manufactured in two steps: stamping and assembly. Each frame is made up of three pieces: one unit of part Aand two units of part B. The parts are fabricated by a single stamping machine that requires a setup time of 90 minutes switching between the two part types. Once the machine is set up, the activity time for parts, regardless of type, is 30 seconds each piece. Currently, the stamping machine rotates its production between one batch of 120 part A's and 240 part B's. Completed parts move only when the entire batch is produced. During assembly, parts are assembled manually to form the finished products. The three parts and a number of small purchased components are required for each unit of final product. Each product requires 30 minutes of labor time to assemble. There are 12 workers in assembly. There is sufficient demand to sell every scooter the system can make. At the current batch sizes, the bottleneck of the system is O stamping Le] o assembly oO they both have the same capacity oO cannot be determined