A new product needs 50 labor hours to complete the build for the ?rst unit. If production operates at a 70% learning curve rate, calculate the average labor hours (rounded to the closest hundredth hour) required per unit to produce four units. Note that after calculating the exponent “b” in Equation 2-5, round “b” to the fifth decimal place (e.g., -0.73468) and then use “b” in Equation 2-4.