As a consultant, you are reviewing the financial documents of a firm. As is often the case, the data are limited. Specifically, in this case, you are only able to observe that the firm produced 10 units of output, and that the average cost of production equaled $20. You do know (from other sources) that the firm's fixed cost equals $100. You also know that producing 10 units minimizes the firm's average cost of production. The firm that hired you to analyze these data wants to know what the marginal cost was for the tenth unit of output that the firm produced. Your answer is $

The expenditures and receipts below are related to land, land improvements, and buildings acquired for use in a business enterprise. the receipts are enclosed in parentheses. money borrowed to pay building contractor (signed a note) $(276,500 ) (b) payment for construction from note proceeds 276,500 (c) cost of land fill and clearing 11,220 (d) delinquent real estate taxes on property assumed by purchaser 8,340 (e) premium on 6-month insurance policy during construction 12,060 (f) refund of 1-month insurance premium because construction completed early (2,010 ) (g) architect’s fee on building 27,040 (h) cost of real estate purchased as a plant site (land $206,800 and building $55,900) 262,700 (i) commission fee paid to real estate agency 9,620 (j) installation of fences around property 4,030 (k) cost of razing and removing building 10,130 (l) proceeds from salvage of demolished building (4,910 ) (m) interest paid during construction on money borrowed for construction 13,700 (n) cost of parking lots and driveways 17,690 (o) cost of trees and shrubbery planted (permanent in nature) 14,080 (p) excavation costs for new building 2,950 identify each item by letter and list the items in columnar form.