Final answer:
The subject of this question is Business. The Secretary of Defense authorizes an increase in the micro-purchase threshold to $20,000 to support declared contingency operations in Afghanistan.
Step-by-step explanation:
The subject of this question is Business. The question is discussing the Secretary of Defense authorizing an increase in the micro-purchase threshold to $20,000 to support declared contingency operations in Afghanistan. The student is considering taking advantage of this increase to purchase 20 laptops at $500 each.