a person wants to plants some trees in his community Park. the local nursery has to perform this task. it charges the cost of planting trees by the following formula C(x) is equals to x cube - 45 x square + 600 x where x is the number of trees and C(x) is the cost of planting x trees in Rupees. the local authority has imposed a restriction that it can plant 10 to 20 trees in one community park for a fair distribution. for how many trees should the person place the order so that he has to spend the least amount. how much is the least amount?
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He must plant twenty trees
Cost is decreasing by increasing the number of tree
Cost is decreasing by increasing the number of tree
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