Problem $4(5$ points$)$: A manager wants to analyze the learning curve associated with producing one of his company's products. The first unit takes $5$ minutes, and the learning curve is $80\%.$ How long does the sixth unit take $($in minutes$)?$ Problem $4(5$ points$)$: A manager wants to analyze the learning curve associated with producing one of his company's products. The first unit takes $5$ minutes, and the learning curve is $\backslash (80\backslash \%\backslash ).$ How long does the sixtl unit take $($in minutes$)?$