Bob Dresser Operates a Major Appliance Warranty Service Center A What Is the Optimal Sequence of Jobs for the Operation

question 133

Essay

Bob Dresser operates a major appliance warranty service center. His operation has two check stations that are required at the end of every repair task performed by his appliance repair staff. These are the Functionality Review (FR) and the Overall Scan (OS). The FR must be performed successfully before the OS is begun. On Friday morning, six repair jobs are completed, awaiting these two inspection activities. Processing times are given in minutes.
$$\begin{array} { | c | c | c | } \hline \text { Job } & \text { FR } & \text { OS } \\\hline \text { A } & 50 & 30 \\\hline \text { B } & 35 & 55 \\\hline \text { C } & 25 & 20 \\\hline \text { D } & 20 & 35 \\\hline \text { E } & 15 & 10 \\\hline \text { F } & 10 & 25 \\\hline\end{array}$$
a. What is the optimal sequence of jobs for the objective of minimizing the total flow time?
b. Show your work, and document the sequence.
c. Chart the solution to this problem.
d. What jobs are being processed at time period 90?
e. What is the total flow time of this problem?
$$\begin{array} { | l | l | l | l | l | l | l | l | l | l | l | } \hline \mathrm { FR } & & & & & & & & & & \\\hline \mathrm { OS } & & & & & & & & & & \\\hline & 20 & 40 & 60 & 80 & 100 & 120 & 140 & 160 & 180 & 200 \\\hline\end{array}$$

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Definitions:

Investment Obstacles

Challenges or barriers that hinder the allocation of capital into projects or opportunities, potentially restricting economic growth and productivity.

Developing Nations

Refers to countries that are in the process of industrialization and have lower levels of economic prosperity, compared to developed nations.

Public Infrastructure

Physical and organizational facilities and structures needed for the operation of a society or enterprise, such as roads, bridges, and water supply.

Private Investment

The expenditure by private (non-government) firms on capital goods, such as equipment, buildings, and inventory investments.