A bank has $$100$ in checking deposits $.$ Interest and noninterest costs on these accounts are $8\%.$ This bank has $ $600$ in savings and time deposits with interest and noninterest costs of $12\%.$ This bank has $ $100$ in equity capital with a cost of $26\%.$ This bank has estimated that reserve requirements $,$ deposit insurance fees and uncollected balances reduce the amount of money available on checking deposits by $20\%$ and on savings and time deposits by $5\%.$ What is the bank's before$-$tax cost of funds?

A$.13\mathrm{.}25\%$

B$.13\mathrm{.}44\%$

C$.15\mathrm{.}33\%$

D$.19\mathrm{.}17\%$