Final answer:
The net capital spending for 2021 is -$150,000.
Step-by-step explanation:
Net capital spending can be calculated by subtracting the depreciation expense from the change in net fixed assets. In this case, the change in net fixed assets is $4.2 million - $4 million = $0.2 million. Therefore, the net capital spending for 2021 is $0.2 million - $350,000 = -$150,000.