Use this info for questions $9$ through $13.$

Chuck's Custom Boats $($CCB$)$ builds customer luxury yachts. CCB has landed a contract with a mysterious New York real estate developer, Mr$.$ T$.$ Relevant data on the project are shown below. The complication is that Mr$.$ T wants delivery in $30$ weeks or he will impose a penalty of $$250$ for each week his yacht is late. Determine the lowest cost plan for crashing this project.

$($What is the cost of the third crash, what is the cost of the fifth crash, what is the total cost of all crashes that should be done to minimize costs?, how much should be spent on penalties?$)$