You are evaluating a $4-$year project, and its cash flows are $-70000,18000,22000,24000,18000$ for years $0$ to $4,$ respectively. What is the project's IRR?

Question $10$ options:

$6\mathrm{.}6\%$

$8\mathrm{.}3\%$

$9\mathrm{.}2\%$

$10\mathrm{.}4\%$

$11\mathrm{.}2\%$

$12\%$