A loan of $$10,000$ is taken out on November $7,2020$ at a simple interest rate of r $=9\%.$ The loan will be paid back on May $11,2021.$ If the bank uses ordinary interest $($the Banker's Rule$),$ how much interest is charged?

a

$$450\mathrm{.}00$

b

$$456\mathrm{.}16$

c

$$443\mathrm{.}84$

d

$$462\mathrm{.}50$