A company purchased $1,800 of merchandise on July 5 with terms 2/10, n/30. On July 7, it returned $200 worth of merchandise. On July 28, it paid the full amount due. The amount of the cash paid on July 28 equals:
A) $1,600. B) $1,800. C) $1,568. D) $1,564. E) $200.