$2\mathrm{.}22$: Consider Problems $2\mathrm{.}20$ and $2\mathrm{.}21.$ Assume for operation $4$ that the assembly operation has a standard time of four minutes, reliability of $95\%,$ and efficiency of $98\%.$ Compute the number of assembly machines required for each scrap level. What is the impact of the scrap percentage on the number of machines? Why might a facilities planner want to be involved in the requirements definition process? $2\mathrm{.}20$ Part A is produced on machine $1$ and then machine $2.$ One unit of Part A is assembled

with three units of Part B$,$ which is produced on machine $3,$ in assembly station $4.$ Ma$-$

chine $1$ has a scrap factor of $20\%,$ and machine $2$ has a scrap factor of $10\%.$ The as$-$

sembly process has a scrap factor of $15\%.$ Another part, Part C$,$ is produced on

machine $5$ and has a scrap estimate of $25\%.$ Part C and the subassembly comprison of

Part A and Part B are assembled at assembly station $6$ into the completed product.

Each day, $15,000$ units of the completed product are required to meet demand. As$-$

suming that machine $3$ and assembly station $6$ have scrap factors of $30\%$ each, what

are the requirements for Parts $A,B,$ and C in order to meet the daily demand for the

completed product?

$2\mathrm{.}21$ Suppose that in Problem $2\mathrm{.}20,$ each process was able to reduce its scrap estimate by

$5\%.$ What would the percent change in the requirement for each input be$?$ What signif$-$

icance can this have on the process designer's decision making process? $($Hint: There

are two ways of looking at this problem, either from the estimation perspective or from

the continuous improvement perspective.$)$

$2\mathrm{.}22$ Consider Problems $2\mathrm{.}20$ and $2\mathrm{.}21.$ Assume for operation $4$ that the assembly operation

has a standard time of four minutes, reliability of $95\%,$ and efficiency of $98\%.$ Compute

the number of assembly machines required for each scrap level. What is the impact of

the scrap percentage on the number of machines? Why might a facilities planner want

to be involved in the requirements definition process?