Your neighbor Bill, a liberal arts major who knows little about finance, has financed his college education with his Citibank Visa Card. Upon graduation, Bill’s credit card debt is $12,000. If Bill plans to pay off his debt with equal monthly payments for 5 years, and the annual interest rate on his Visa card is 18%, what will be Bill's monthly payment? 

a) $125 

b) $305 

c) $236 

d) $267 

e) $2,160