Kochyo purchases an inventory of spare parts on credit from its suppliers for $15,000. During the month Kochyo pays its suppliers $10,000 and sells spare parts (which cost the business $8,000) to its customers on credit for $20,000. Customers pay Kochyo $12,000 during the month.

Question options:

A. $5,000

B. $7,000

C. $12,000

D. $2,000

E. $8,000