ABC purchased a machine costing $$5,00,000$ with an estimated salvage value of $ $50,000$ and an estimated useful running life of $10,000$ hours. If the machine was run for $2000$ hours in its first year, depreciation to be charged for the year would be:

a$.$ $ $80,000$

b$.$ $ $70,000$

c$.$ $ $90,000$

d$.$ $$1,00,000$