Q$5.$ If merchandise is sold on account to a customer for $$1,000,$ terms FOB shipping point, $1/10,$ n$/30,$ and the seller prepays $$50$ in freight, the amount of the discount for early payment would be:

A$.$ $$0$

B$.$ $$5\mathrm{.}00$

C$.$ $$10\mathrm{.}00$

D$.$ $$10\mathrm{.}50$