$$21\mathrm{.}00$ per breaker.

a$.$ How many breakers would the electricar switching equipment company need per year to make the in$-$house option the least costly$?$

The company should consume $$ breakers per year to make the manufacturing the part in$-$house option the least costly$.($Enter your response rounded to the nearest whole number.$)$ this concession, the subcontractor will drop the per unit price to $$15\mathrm{.}00.$ Under this assumption, how many breakers would the ESE company need per year to make the in$-$house option least costly$?$

The company should consume $$ breakers per year to make the manufacturing the part in$-$house option the least costly$.($Enter your response rounded to the nearest whole number.$)$

The least costly option is $$ with a total cost of

s $($Enter your response rounded to the nearest whole number.$)$