PQR$,$ Inc., is considering investing $$160,000$ in a machine that may last $4$ years with no residual value. The new machine will generate annual operating income of $$60,000$ per year for $4$ years. What is the Simple rate of return?

A$.12\mathrm{.}5\%$

B$.10\mathrm{.}5\%$

C$.14\%$

D$.15\mathrm{.}66\%$