The following table tracks the main components of working capital over the life of a four-year project. 2019 2023 Accounts receivable Inventory Accounts payable 80,000 27,500 2020 160,000 135,000 52,500 2021 235,000 135,000 55,000 2022 200,000 100,000 37,500 Calculate net working capital and the cash inflows and outflows due to investment in working capital. (Negative answers should be indicated by a minus sign.) 2019 2020 2021 2022 2023 Net working capital Cash flows