Use the table below to answer the following question$($s$).$

Pickson Luthiers Corporation makes four models of electric guitars, ScarCT, Dela Mort, Warax, and Invazen. Each guitar must flow through five departments, assembly, painting, sound testing, inspection, and packaging. The table below shows the relevant data. Production rates are shown in units$/$hour$.($ScarCT is assembled elsewhere$).$ Pickson wants to determine how many guitars to make to maximize monthly profit. Use a linear optimization model based on the data to answer the following question.

According to the Sensitivity Report, by how much should the unit profit on ScarCT be increased in order for its production to be feasible?

Question $10$ options:

$$60$

$$120$

$$30$

$$90$