Considering a worker's performance it was observed, during a $9$ hour shift he was producing $25$ units. Due to the audit the employee was extra careful and was working $10\%$ slower than his usual speed. He had $3$ allowances with an average of $15\%.$ Calculate the normal time for this employee to produce units?

$20$ minutes

$*19\mathrm{.}44$ minutes

$*18\mathrm{.}38$ minutes

$*26\mathrm{.}4$ minutes