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Nearly $ 4 0 billion of sofas and sofa sets are sold each year in the United States 1 . Making a sofa is a

Nearly $40 billion of sofas and sofa sets are sold each year in the United States1
. Making a sofa is a
complex multi-step process. Making one by hand can take between 200-to-300 hours; however, a
modern factory can make a sofa every 10-to-15 minutes. These reduced times are the result of
automation and optimized factory layout and line balancing. Below are basic diagrams of how sofas are
constructed.According to Koruca, Koker, Chehbi-Gamoura and Ulsik (2018)2
in a modern well-run factory dedicated
to manufacturing sofas, there are 32 workstations with an average cycle (Takt) time of 601.3 seconds
.
Assume that each workstation has one worker. The average American factory worker makes $15.00. per hour, adding fringes, benefits and payroll taxes, the total hourly cost is $20.10 per hour. In China
the average factory workers salary is 8,000 Yuan per month
, which comes to $1,200 per month, or an
hourly rate of $6.92. Including 20% for employers social security contribution (health insurance,
maternity insurance, work related injury insurance and unemployment insurance) the hourly cost of a
Chinese factory worker is $8.31 per hour. The average cost to ship a container from China to the Port
of Los Angles is given in the table below6
. Depending upon the size of the sofa, there are anywhere
from 8-to-18 sofas per shipping container
Standard Container Shipping Cost from China to USA
Charge Low High
Factory to port $ 50 $ 480
Clearance 100300
Shipping Shenzhen, China to LA, CA. USA 2,2302,460
Insurance (0.2%)818
Port charges 100450
Customs bond 100200
Local Charges 100450
A typical US furniture manufacturer sells 11,560 sofas annually (or approximately 32 sofas per day). It
spends $175 on raw and processed materials per sofa and sells sofas to furniture stores at an average
wholesale price of $650, whether the sofas are made in the USA or China. This company is considering
outsourcing the sofas to a Chinese manufacturer. If the company decides to outsource, it will purchase
the sofas at an average price of $289.63 FOB. Approximately 3% of the sofas manufactured in the USA
are damaged in transit while, 8% of sofas made in China are damaged in transit. 98% of customers
backorder damaged sofas. The rehandling fees for damaged sofas are $250 each. The company would
be able to sell its production equipment for $1.2 million and get rid of its factory for $1.6 million; as
well as the overhead and expenses associate with the factory. The order cycle time for producing in
the USA is 4 days, with a standard deviation of 1 day. The order cycle time for producing in China is 14
days with a standard deviation of 4 days.
Answer question 3
(3) using an average of 12
sofas per shipping container, calculate the average cost of shipping a sofa.

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