A building was constructed at a cost of 10,00,000. This building was estimated to have a useful life of 50 years with no scrap value. How much is the building worth at the end of 40 years if...

A building was constructed at a cost of 10,00,000. This building was estimated to have a useful life of 50 years with no scrap value.

How much is the building worth at the end of 40 years if depreciation charges had been set as follows:

double declining for the first 15 years.