Explanation please

1) The Maryville Construction Company occupies 85,000 square feet for construction of mobile homes. There are two manufacturing departments, finishing and assembly, and four service departments labeled S1, S2, S3, and S4. Information relevant to Maryville is as follows: Allocation Assembly 0.50 0.40 0.10 0.10 Department Area used si S2 s3 54 Finishing 31 17,000 0.100.20 0.20 S2 4,250 0.300.30 93 8,500 0.20 0.20 0.30 0.20 94 4,250 0.30 0.10 0.30 0.20 Finishing 21,250 Assembly 29,750 Rent paid for the area used is $720,000. How much rent would be chargedhto S4 using the direct method of allocation? A) $36,000. B) $40,000. C) $54,000. D) $90,000 E) SO. chargehto