Compute the specified quantity. Round all answers to the nearest month, the nearest cent, or the nearest $0.001 \%$, as appropriate.
\mathrm{\{} T r e a s u r y ~ B i l l s ~ I n ~ D e c e m b e r ~ 2008 (in the midst of the finan-
cial crisis) a $\$ 5,0006$ -month T-bill was selling at a discount rate of only $0.25 \% .{ }^{1}$ What was its simple annual yield?