Can you help me to solve this problem, thank you!

Podey Company has a machine that originally cost $20,000, has accumulated depreciation of $14,000 at the beginning of the current year, and is being depreciated at $2,000 per year with the straight-line method. If the company sells the machine for $2,400 on September 30, it first records a depreciation expense of

$500.

$1,500.

$3,600.

$6,000.