i don not undertstand how its that answer using Acceralted methods

TorQue, Inc purchased a vehicle on March 15 of this year for $50,000 and will depreclate it using the double-declining balance method over 4 years, taking a full month's depreciation in the first month. The CFO estimates the residual value at $10,000. What is the deprociation expense for the first yeat, rounded to the nearest hundred? 58.000 516.700 512500 520.800 Correct. The rate is 50 os on the book value of 550,000 , prorated for 10 monthe