Pine inc. adopts the revaluation model for its plant and machinery. The company acquires one item of plant for HK$10,000 on 1 January 2021. The plant is depreciated on a straight-line basis over its useful economic life, which is estimated to be five years. On 1 January 2023 the company revalues the plant at its fair value of HK$9,600. On 1 January 2025 the plant is sold for HK$4,000. Any revaluation surplus is amortised to retained earnings as the plant is being depreciated. Required Determine revaluations surplus if any and prepare journal entries for Jan. 1 2023 and Jan. 12025