Company RNR had a small machine that it purchased on 1/4/2018. The machine had a useful life of 6 years, and a salvage value of $ 5.000. On 31/12/2020, the balance sheet for RNR shows accumulated depreciation of $ 20,625. If the company uses the straight line depreciation method, what was the purchase cost of this machine? (Note: write your answer as a number only, with no commas or signs. If your answer is S 1,000, write it as 1000)