Question $6(6$ points$)$

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The first unit of production takes $12$ hours to produce and the learning rate is expected to be $80$ percent. How long will it take to produce the sixth unit?

greater than $6\mathrm{.}0$ hours but less than or equal to $7\mathrm{.}7$ hours

greater than $8\mathrm{.}0$ hours

less than or equal to $6\mathrm{.}0$ hours

greater than $7\mathrm{.}7$ but less than or equal to $9\mathrm{.}5$ hours