A clothing design company pays two different people to design its T-shirts.
The company pays person A $8 an hour and pays person B $12. Person A
cannot work more than twice as many hours as person B, but they cannot
work more than 20 hours total. Person A makes the company a profit of $10
an hour, and person B makes the company a profit of $20 an hour. If the
company wants to make at least $150 in profit, which value will minimize the
cost to the company? (Each point is (a, b), where a is the hours person A
works and b is the hours person B works.)

A. (13.33, 6.67)
B. (7.5, 12.5)
C. (0,20)
D. (0, 7.5)