19- The material quantity purchased by a business, which remains the most economical in size, is called:

Minimum stock level

Re-order stock level

Average stock level

None of these

20- Bedaux point premium system requires to give the supervisors a bonus equal to:

75% of the time saved by the supervisor

25% of the time saved by the supervisor

75% of the time saved by the worker

25% of the time saved by the worker