GJ Company, a manufacturer, has provided the following information pertaining to its recent year of operation:

Net income, $400,000

Accounts payable decreased $32,000

Prepaid assets increased $21,000

Depreciation expense was $43,000

Accounts receivable decreased $31,000

Loss on sale of a depreciable asset was $21,000

Wages payable increased $29,000

Unearned revenue decreased $21,000

Patent amortization expense was $15,000

Using the indirect method, how much was GJ's net cash provided by operating activities?

a. $465,000

b. $507,000

c. $335,000

d. $444,000