In March 2019, Henley Organization purchased production equipment valued at $640,000. In 2021, auditors discovered that half of the value of the equipment had been originally expensed in 2019. At the time of acquisition, the equipment was expected to last 8 years, with no salvage value. Henley uses straight-line depreciation for this type of asset and follows a policy of recording a full year of depreciation in the year of acquisition. Henley's tax rate is 28%.

Required:

a) Calculate the retrospective adjustment required and provide the appropriate journal entry to record this adjustment.

b) Calculate the correct amount of depreciation for 2021 and provide the year-end entry.