lestion $3$: A company has an investment project that would cost $$10$ willion lay and yield a payoff of $$15$ million in $4$ years.

$(1)$ Should the firm undertake the project if the interest rate is $11$ percent? $10$ percent? $9$ percent? $8$ percent?

$(2)$ Can you figure out the exact interest rate at which the firm would be indifferent between undertaking and forgoing the project? $($This interest rate is called the project's internal rate of return.$)$

$1$lol