BigApp Delivery Inc. had net working capital of $300,000 and $140,000 at the end of 2018 and 2019, respectively. It had net capital spending of $170,000 and $80,000, respectively, during 2018 and 2019. In 2019. its operating cash flow was $200,000. What was its cash flow from assets in 2019? $30,000 O $170,000 $90,000 $280,000