Lazer Technologies Inc. $($LTI$)$ has produced a total of $20$ high$-$power laser systems that could be used to destroy any approaching

enemy missiles or aircraft. The $20$ units have been produced, funded in part as private research within the research and development

orm of LTI, but the bulk of the funding came from a contract with the U$.$S$.$ Department of Defense $($DoD$).$

Testing of the laser units has shown that they are effective defense weapons, and if redesigned to add portability and easier field

maintenance, the units could be truck$-$mounted.

The DoD has asked LTI to submit a bid for $100$ more units.

The $20$ units that LTI has built so far cost the following amounts and are listed in the order in which they were produced: Use Exhibit

$6\mathrm{.}4$ and Exhibit $6\mathrm{.}5$

a$.$ Based on past experience, what is the learning rate? $($Do not round Intermedlate calculatlons. Round your answer to the nearest

whole percent.$)$

Learring rale

b$.$ What cost should LTI use in their bid for the total order of $100$ additional units, assuming that learning continues? $($Use your rounded

learning rate from Part a$.$ Enter your answer In millions of dollars rounded to one decimal place.$)$

Cast for $120$ more units

c$.$ What is the cost expected to be for the last unit under the learning rate you estimated? $($Use your rounded learning rate from Part

a$.$ Enter your answer In millions of dollars rounded to one decimal place.$)$