Question $1)(25$ points$)$ Consider a machine in a manufacturing center that can process multiple types of products. During a day, the machine is available for $8$ hours. We have a set of potential items that can be processed on this machine and after the process, each item can be sold to a customer. Assume that we only can sell one copy of each item. Table below shows the processing times and the potential profit of each item.

$\backslash$table$[[$Item$,$A$,$B$,$C$,$D$,$E$,$F$],[\backslash$table$[[$Processing time$],[($minutes$)]],75,80,95,85,90,100],[$Revenue $($$$),432,412,754,679,545,723]]$

$3-$ What is the solution of the problem if we assume that we can sell multiple copies of each item? How the objective function value changes if we consider this new assumption? Use Excel to solve the problem with this new assumption.

Answer: Value of the objective function with the new assumption: