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Aqua Spring produces agricultural irrigation equipment. During a year, the amount of overhead costs on a per-month basis varies in relation to the machine hours used in a given year. The low for the past year was 4,770 hours, and the expense associated was $142,360. The high for the period was 6,900 hours, and the associated expense was $186,617. During the low month, the $142,360 in overhead costs consisted of indirect materials of $95,400 (a variable expense), rent of $35,250 (a fixed expense), and maintenance costs of $11,710 (a mixed expense). Requirements Requirement 1a. Given the breakdown of expenses in the low period, what are the estimated costs for indirect materials during the high period? (Round to the nearest whole dollar.) The estimated costs for indirect materials are $ 138000. Requirement 1b. Given the breakdown of expenses in the low period, what are the estimated costs for rent during the high period? (Round to the nearest whole dollar.) The estimated costs for rent are $ 35250 . Requirement 1c. Given the breakdown of expenses in the low period, what are the estimated costs for maintenance during the high period? (Round to the nearest whole dollar.) The estimated costs for maintenance are $0. 1. Given the breakdown of expenses in the low period, what are the estimated costs for (a) indirect materials, (b) rent, and (c) maintenance during the high period? 2. What is the cost function for maintenance costs? 3. What amount of maintenance costs would be expected with 7,800 machine hours of work? 4. What would be the total overhead costs at 7,800 machine hours