Fisher Enterprises increased the productivity of its machines with an expenditure of $300,000 on January 1, 20X9. The machines were originally purchased on January 1, 20X6 for $1,600,000 and had an expected salvage value of $100,000 and a useful life of 15 years. If Fisher uses the straight-line method, depreciation expense recorded on December 31, 20X9 would be:

$150,000.

$75,000.

$125,000.

$200,000.

$100,000.