Which investment alternative is recommended in Problem 11.7, if

a. the weightings for the three factors are 50, 10, and 40?

b. the rating values for fill time for A, B, and C are 5, 7, and 10, respectively?

c. another factor is introduced, safety (S), the weights assigned to the factors (PW, T, F, and S) are 30, 20, 10, and 40, and the rating values for S are 10, 8, and 9 for A, B, and C, respectively?