At the civil engineering Rose is a Project Manager consulting firm of Gravel, Sands, Concrete, and the Waters, Inc. She has been collecting data on a project however not all the data is available. She has been able to find out that the 10th pillar needed 260 person-hours to construct, and that a 75% learning curve applied. She is interested in calculating the time needed to construct the 1st and the 20th pillars. Calculate the values for her.