Ou’ve just completed a pilot run of 10 units of a major product and found the processing time for each unit was as follows: use exhibit 4a.5 and exhibit 4a.6. unit number time (hours) 1 810 2 580 3 510 4 440 5 420 6 380 7 360 8 340 9 330 10 320 a. according to the pilot run, what would you estimate the learning rate to be? (do not round intermediate calculations. round your answer to the nearest whole percent.) b. based on part (a), how much time would it take for the next 190 units, assuming no loss of learning? (round your answer to the nearest whole number.)