Depreciation of revalued asset

A company revalued its land and buildings at the start of the year to $10million ($4m for the land ) . The property cost $5million ($1m for the land ) ten years prior to the revaluation . The total expected useful life of 50years is unchanged . The company’s policy is to make an annual transfer amounts to retained earnings . Show the effect of the above on the financial statements for the year.

my confusion is:

depreciation calculation=4/50 i.e 0.08 this is only of 1 year, if multiplied 0.08*10 is 0.8, please if you can clarify?