Exotic Furnishings Ltd$.$ has a line of credit secured by the equity in the business. The limit on the line of credit is $$$$44000.$ Exotic owed $$$$25302\mathrm{.}07$ on its line of credit on April $1.$ The line of credit agreement requires a regular payment of $$$$100\mathrm{.}00$ on the principal plus interest$($including overdraft$$ interest$)$ by electronic transfer after closing on the last day of each month. Overdraft interest is $17\%$ p$.$a$.$ The line of credit interest is variable. It was $5\mathrm{.}4\%$ on April $1,5\mathrm{.}9\%$ effective June $16,$ and $6\mathrm{.}95\%$ effective September $14.$

$($a$)$ Calculate the interest payments on April $30,$ May $31,$ June $30,$ July $31,$ August $31,$ and September $30.$

$($b$)$ What is the account balance on September $30?$