There are five jobs in a factory. All these jobs have to go through two workstations for processing. Each job is processed on Workstation #1 and then on Workstation #2. The processing time for each job on each workstation is given below. Job; Time on Workstation #1 (minutes); Time on Workstation #2 (minutes)
A; 50; 50
B; 20; 8
C; 25; 50
D; 30; 12
E; 11; 22
F; 11; 19

Using Johnson's sequencing rule, it can be concluded that the makespan of the sequence is:

a. more than 50 but less than or equal to 100 minutes.
b. more than 100 but less than or equal to 150 minutes.
c. more than 150 but less than or equal to 200 minutes.
d. more than 200 but less than or equal to 250 minutes.

Asmall town wants to build some new recreational facilities. the proposed facilities include a swimming pool, recreation center, basketball court and baseball field. the town council wants to provide the facilities which will be used by the most people, but they face budget and land limitations. the town has $400,000 and 14 acres of land. the pool requires locker facilities which would be in the recreation center, so if the swimming pool is built the recreation center must also be built. also, the council has only enough flat land to build the basketball court or the baseball field. the daily usage and cost of the facilities (in $1,000) are shown below. which facilities should they build? facilityusagecost ($1,000)landswimming pool4001002recreation center5002003basketball court3001504baseball field2001005