4. Elena Corporation purchased a patent for a new product from the inventor for 180,000 on January 1, 2020. It had a useful life of 10 years. Elena made minor modifications to the patent and spent additional registration and legal fees of 48,000 on January 2,2022 , extending the life of the old patent to a useful life of 12 years. What amount should be reported for patent amortization expense on 12/31/21