A writer was paid 36,000 for a 4,000-word article. How much is that per word?

A: $0.11
B: $90
C: $144,000
D: $9

To find the cost per word, divide the total payment by the number of words.

Total payment / Number of words = Cost per word

$36,000 / 4,000 = $9

Therefore, the cost per word is $9.

The correct answer is D. $9.