Afirm had purchases of $16,200, freight charges of $300, and purchases returns and allowances of $1,100 during one month. its net delivered cost of purchases was:
a. $14,800. b. $17,600. c. $16,200. d. $15,400.

Purchases and freight charges:
$16,200 + $300 = $16,500
With returns:
$16,500 - $1,100 = $ 15,400

D ) $15,400

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.