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The small boatyard White Kayaks built 156156 epoxy kayaks last year

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The small boatyard White Kayaks built 156156 epoxy kayaks last year. Each of these requires 12 kg12 kg of epoxy, purchased in 6 kg6 kg barrels at $170$170 each, with a freight cost of $18$18 per shipment plus $1$1 per kgkg. The annual carrying cost is estimated to be 20 %20 % of the value.

a) If the purchase policy is to buy 2020 barrels each time, how much time can be spent on administrative work if the order quantity should be considered optimal? The boat-builder charges $25/hour$25/hour.

b) If time spent is 3030 minutes, what would be the optimal order quantity?