Bank National has reserves of $120, loans at $280, checkable deposits at $340, and bank capital of $60. Regulations require that the bank's capital ratio (capital divided by total assets) must not go below 10%. What is the highest write down of the bank's loans that the bank can sustain without violating the requirement?
(a) $5
(b) $15
(c) $20
(d) $25
Please explain in details how you got your answer, thank you