Effective Investment to Reduce Setup Cost in a Mixture Inventory Model Involving Controllable Backorder Rate and Variable Lead Time with a Service Level Constraint

Table 1

Lead time data.

Lead time component, 𝑖	Normal duration, 𝑏𝑖 (days)	Minimum duration, 𝑎𝑖 (days)	Unit crashing cost, 𝑐𝑖 ($/day)
1	20	6	0.4
2	20	6	1.2
3	16	9	5.0