Project A has an upfront cost of $$300$ and, starting one year today, pays an annual cash flow of $$36$ forever $($i$.$e$.,$ it is a perpetuity$).$ Project B has an upfront cost of $$440$ and, starting one year today, pays an annual cash flow of $$43$ forever $($i$.$e$.,$ it is a perpetuity$).$ What is the crossover rate for these two projects?

a$\mathrm{.}0\mathrm{.}045$

b$\mathrm{.}0\mathrm{.}055$

c$\mathrm{.}0\mathrm{.}050$

d$\mathrm{.}0\mathrm{.}065$

e$\mathrm{.}0\mathrm{.}040$

f$\mathrm{.}0\mathrm{.}060$

g$\mathrm{.}0\mathrm{.}048$

h$\mathrm{.}0\mathrm{.}058$