CRITICAL RATIO. Today is day 25 on Zyco Medical Testing Laboratories’ production schedule. Three jobs are on order, as indicated here:

JOB DUE DATE WORKDAYS REMAINING

A 30 4

B 28 5

C 27 2

APPROACH $\blacktriangleright$ Zyco wants to compute the critical ratios, using the formula for CR.

Question

CRITICAL RATIO. Today is day 25 on Zyco Medical Testing Laboratories’ production schedule. Three jobs are on order, as indicated here:

JOB	DUE DATE	WORKDAYS REMAINING
A	30	4
B	28	5
C	27	2

APPROACH [latex]\blacktriangleright[/latex] Zyco wants to compute the critical ratios, using the formula for CR.

Accepted Answer

SOLUTION [latex]\blacktriangleright[/latex]

JOB	DUE DATE	WORKDAYS REMAINING
A	(30 - 25)/4 = 1.25	3
B	(28 - 25)/5 = .60	1
C	(27 - 25)/2 = 1.00	2

INSIGHT [latex]\blacktriangleright[/latex] Job B has a critical ratio of less than 1, meaning it will be late unless expedited. Thus, it has the highest priority. Job C is on time, and job A has some slack. Once job B has been completed, we would recompute the critical ratios for jobs A and C to determine whether their priorities have changed.
LEARNING EXERCISE [latex]\blacktriangleright[/latex] Today is day 24 (a day earlier) on Zyco’s schedule. Recompute the CRs and determine the priorities. [Answer: 1.5, 0.8, 1.5; B is still number 1, but now jobs A and C are tied for second.]
RELATED PROBLEMS [latex]\blacktriangleright[/latex] 15.16, 15.17e, 15.21

Question 15.EX.6: CRITICAL RATIO. Today is day 25 on Zyco Medical Testing Labo...

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