International door slammers has an order to deliver 500 door slammers on day 130. Draw up a backward schedule under the following conditions: a. only one machine is assigned to each operation b. Schedule one 8 hour shift per day for 5 days per week c. all parts are to move in one lot for 500 pieces. d. allow 8 hours between operations for queue and move times. A slammer consists of three parts. Purchased components C and D form subassembly A. Subassembly A and component B form the final assembly. Part B is machined in three operations. No special tooling is required except for part B, operation 20. It takes 24 hours to make the tooling. Material is available for all parts. Standard times for the lot of 500 are as follows:

Part Operation Standard time
B 10 10
20 8
30 6
Subassembly A 18
Final assembly 5