Please help B and C

The 20 units that LTI has built so far cost the following amounts and are listed in the order in which they were produced: Use Exhibit 4A.5 and Exhibit 4A.6. UNIT NUMBER 1 2 COST {$ MILLIONS) $13. 10.1 9.2 8.1 7.7 7.3 6.9 6.6 6.3 6.2 UNIT NUMBER 11 12 13 14 15 16 17 18 19 20 5 6 7 8 9 10 COST ($ MILLIONS) $5.9 3.8 5.6 5.5 5.3 5.3 5.2 5.0 4.9 5.0 a. Based on post experience, what is the learning rate? (Do not round intermediate calculations. Round your answer to the nearest whole percent.) Answer is complete and correct. Learning rate 80 % b. What cost should LTI use in their bid for the total order of 100 additional units, assuming that learning continues? (Use your rounded learning rate from Parta. Enter your answer in millions of dollars rounded to one decimal place.) Answer is complete but not entirely correct. Cost for 100 more units 318.8 million dollars Answer is complete and correct. Leaming role BO nts b. What cost should LTI use in their bid for the total order of 100 additional units, assuming that learning continues? (Uwe your rounded learning rate from Parta. Enter your answer in millions of dollars rounded to one decimal place) Answer is complete but not entirely correct. Cont for 100 mare units 318.8 million dollar c. What is the cost expected to be for the last unit under the teaming rate you estimated (Use your rounded learning rate from Pun a. Enter your answer in millions of dollars rounded to one decimal place.) Answer is complete but not entirely correct. Expected cost for lastunt $ 2.5 milion dollar