$10-25.($IRR of uneven cash$-$flow stream$)$ Giddy Entertainment Company is considering the construction of a new amusement park. The park will have an initial cash outlay of $$8$ million and will produce free cash flows of $$3\mathrm{.}5$ million at the end of year $1,$$$4\mathrm{.}2$ million at the end of year $2,$ and $$2\mathrm{.}6$ million at the end of years $3$ through $5.$ What is the internal rate of return on this new amusement park?