The following data were obtained from a study of the times required to conduct a consumer test panel study:

Costs are given in thousands of dollars, time in weeks.
(a) Find the all-normal schedule and cost.
(b) Find the all-crash schedule and cost.
(c) Find the total cost required to expedite all activities from all-normal (case a) to all-crash (case b).
(d) Find the least-cost plan for the all-crash time schedule. Start from the all-crash problem (b). Assume partialcrashing.

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Crash Schcdulc Normal Schcdule Activi Timc Cost Tim c Cost 1-2: City center 1-3: City $6 northeast 2-4: City south 3-4: City 10 southeast 2-6: City west 4-6: County east 4-5: County 5 6-7: County 5-7: County west 1