Can someone help me with this and help me unserstand why

Ashkar Company ordered a machine on January 1 at an invoice price of $21.000 On the date of delivery. January 2, the company paid $6,000 on the machine, with the balance on credit at 10 percent interest due in six months. On January 3, it paid $1,000 for freight on the machine. On January 5, Ashkar paid installation costs relating to the machine amounting to $2, 500. On July 1, the company paid the balance due on the machine plus the interest. On December 31 (the end of the accounting period). Ashkar recorded depreciation on the machine using the straight-line method with an estimated useful life of 10 years and an estimated residual value of $4,000. Compute the acquisition cost of the machine