On December 31, 2020, Roseland Company experienced a decline in the value of inventory resulting in writedown from P4,000,000 cost to P3,500,000 net realizable value. The entity used the allowance method to record the necessary adjustment. In 2021, market conditions have improved dramatically.

On December 31, 2021, the inventory had a cost of P5,000,000 and net realizable value of P4,800,000.

What amount should be recognized as gain on reversal of inventory writedown in 2021?