What's the rate of return you would earn if you paid $$1,780$ for a perpetuity that pays $$85$ per year?

a$.4\mathrm{.}63\%$

b$.5\mathrm{.}92\%$

c$.4\mathrm{.}25\%$

d$.4\mathrm{.}78\%$

e$.4\mathrm{.}92\%$