hello, how would i find the depreciation using double declining method if the fiscal year-end is September 30.

On January 1, 2015, a machine was purchased for $90,000. The machine has an estimated salvage value of $6,000 and an estimated useful life of 5 years. The machine can operate for 100,000 hours before it needs to be replaced. The company closed its books on December 31 and operates the machine as fol-lows: 2015, 20,000 hours; 2016, 25,000 hours; 2017, 15,000 hours; 2018, 30,000 hours; and 2019, 10,000 hours.