The National Institute of Health conducted a study to test male birth control pills by using two groups of mice as the study participants. Group A received a drug called Nokids which cost $20,000 and Group B received a drug called Noparents which cost $5,000. The administrative cost to administer each drug is $500 a day. Group A received the drug for 10 days and Group B received the drug for 14 days. What is the incremental cost of Nokids? While conducting the experiment the researchers learned that both medications were contaminated with a poisonous substance. Group A had a survival rate (incremental effectiveness) of 18 days while Group B had a survival rate (incremental effectiveness) of 14 days. What is the incremental cost of Nokids?

(a) $22,500

(b) $18,000

(c) $12,500

(d) $10,000