A project involves eight activities with the precedence relationship and duration as shown in the table below. The slack for the activity D ____________ hours (answer in integer).
A company uses 3000 units of a part annually. The units are priced as given in the table below. It costs rupee 150 to place an order. Carrying costs are 40 percent of the purchase price per unit on an annual basis. The minimum total annual cost is rupee ___________ (rounded off to 1 decimal place).} 