Larry Teng works for a company that uses a percentage method to compute the federal income tax withheld. Larry is single and claims one additional dependent. The weekly exempt amount as claimed on the $W-4$ is $$61\mathrm{.}54$ each. He earns $$680$ a week. What amount should be withheld from his gross pay?

a$.$ $$68\mathrm{.}69$

b$.$ $$69\mathrm{.}90$

c$.$ $$81\mathrm{.}90$

d$.$ $$90\mathrm{.}65$