4. Prepare the following journal entries and calculations: (a) A patent that was expires in 15 years and is expected to have value for 4 years. Present the adjusting entry to amortize the patent for the current year. (b) Mineral rights acquired for $2,800,000. Present the adjusting entry to record depletion for the current year, during which 350,000 tons of ore were removed and sold. acquired for $450,000 at the beginning of the current year deposit estimated at 4,000,000 tons of ore were on an ore