Rowe Racing is training a new pit crew for its racing team. For its first practice$$ run, the pit crew is able to complete all the tasks in exactly $30$ seconds $$ not exactly$$ world$-$class. Assume the learning curve rate is $75\%.$

How long will the $12$th practice run take $($in seconds$)?($Enter number only. Round answers to $2$ decimal places.$)$

What is the total time the first $15$ practice runs take $($in seconds$)?($Enter number only. Round answers to $2$ decimal places.$)$