A company using the perpetual inventory system purchased inventory worth$$ $$21,000$ on account with terms of$2/10,$ n$/30.$ Defective inventory of$$ $$1,000$ was returned two days$$ later, and the accounts were appropriately adjusted. If the invoice is paid $10$ days after the invoice$$ date, the amount of the purchase discount that would be available to the company is$\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

$$$$410$

B$.$

$$$$440$

C$.$

$$$$420$

D$.$

$$$$400$