Please answer $3$&$4.$

Nearly $$40$ billion of sofas and sofa sets are sold each year in the United States$[1].$ 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 $601\mathrm{.}3$ seconds. Assume that each workstation has one worker. The average American factory worker makes $$15\mathrm{.}00[3]$ per hour, including fringes, benefits and payroll taxes total hourly cost is $$20\mathrm{.}10$ per hour. In China the average factory workers salary is $8,000$ Yuan per month$[4],$ which comes to $$1,200$ per month, or an hourly rate of $$6\mathrm{.}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\mathrm{.}31$ per hour. The average cost to ship a container from China to the Port of Los Angles is given in the table below$[5].$ 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

$100$

$300$

Shipping Shenzhen, China to LA$,$ CA$.$ USA

$2,230$

$2,460$

Insurance $(0\mathrm{.}2\%)$

$8$

$18$

Port charges

$100$

$450$

Customs bond

$100$

$200$

Local Charges

$100$

$450$

From the information above, determine

$(3)3.$ Using an Average of $12$ sofas per shipping container, calculate average cost of shipping a sofa