Use the Following Information for Questions

Multiple Choice

Use the following information for questions
Suppose there is one depositor who earns an income of $100 in each period.She spends $50 for consumption and the remainder goes to her savings account.Assume that a bank doesn't do anything with this money except safeguards it.The bank charges $5 for safeguarding fee.
-Suppose the banking industry is competitive.If the bank charges a loan rate of 18%, safeguarding fee of $5, and there are five depositors and two merchants, what would be the deposit interest rate that the bank can offer to the depositors?

A) 18.0%
B) 15.6%
C) 13.5%
D) 12.4%
E) -10%