Benson Racing is training a new pit crew for its racing team. For its first practice$$ run, the pit crew is able to complete all the tasks in exactly secondsnot exactly$$ world$-$class. The second time$$ around, the crew shaves seconds off its time.

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Part $2$

a$.$ The estimated learning rate for the pit crew is

$$

enter your response here$\%.($Enter your response as a whole$$ number.$)$

Part $3$

b$.$ Mark$$ Benson, owner of Benson$$ Racing, says that the pit crew must be able to complete all the tasks in less than seconds in order to be competitive. Based on the answer to part$$ a$,$ how many times will the pit crew need to practice before it breaks the $-$second $$barrier$?$

Pit crew need to practice

$$

enter your response here times. $($Enter your response as a whole$$ number.$)$

Part $4$

c$.$ Is it realistic to expect the pit crew to experience learning improvements$$ indefinitely?