The Wiethoff Corporation has a contract to manufacture 10000 garden hoses for a consumer. Wiethoff has four different machines that can produce this kind of hose. Because these machines are from different manufacturers and use differing technologies, their specifications are not the same.
Machine Fixed cost to set up production run Variable cost per hose Capacity
1 750 1.25 6000
2 500 1.50 7500
3 1000 1.00 4000
4 300 2.00 5000
Write a constraint to ensure that if machine 4 is used, machine 1 will not be used.
a. y1 + y4 0
b. y1 + y4 = 0
c. y1 + y4 1
d. y1 + y4 0
e. y1 + y4 1