Before a new product can be introduced at Kehls, the activities shown in the file P15_25.xlsx must be completed, where all times are in weeks.

a. Draw the AON project network and determine a critical path and the minimum number of weeks required before the new product can be introduced.

b. The duration of each activity can be reduced by up to two weeks at the following cost per week: A, $80; B,

$60; C, $30; D, $60; E, $40; F, $30; G, $20. (Assume that activity H cannot be crashed.) Determine how to minimize the cost of getting the product into the stores for the peak Christmas sales period, assuming that it is now 12 weeks before this period begins.