A time standard was set as $0\mathrm{.}20$ hour per unit based on the ${50}^{th},$ unit produced. Assume the task has a $90$ percent learning curve.$\frac{1}{3}-$

Refer to Exhibit $6\mathrm{.}4.$

What would be the expected time of the ${100}^{th},{200}^{th},$ and ${400}^{th}$ units? $($Round your answers to $2$ decimal places.$)\frac{1}{3}-$