I need help with letter C. Thanks

Ritter Corporation's accountants prepared the following financial statements for year-end 2019: (Do not round intermediate calculations.) points RITTER CORPORATION Income Statement 2019 Revenue $840 Expenses 610 Depreciation 99 eBook Print Net income $ 131 Dividends $ 111 RITTER CORPORATION Balance Sheets December 31 2018 Assets Cash $ 64 Other current assets 174 Net fixed assets 379 2019 $ 83 188 399 Total assets $ 617 $670 Liabilities and Equity Accounts payable Long-term debt $ 124 149 $ 143 163 RITTER CORPORATION Balance Sheets December 31 2018 Assets Cash $ 64 Other current assets 174 Net fixed assets 379 2019 points $ 83 188 399 Total assets $ 617 eBook $670 Print Liabilities and Equity Accounts payable Long-term debt Stockholders' equity $ 124 149 344 $ 143 163 364 Total liabilities and equity $ 617 $670 a. What is the change in cash during 2019? b. Determine the change in net working capital in 2019. c. Determine the cash flow generated by the firm's assets during 2019. points Stockholders' equity 344 364 Total liabilities and equity $ 617 $670 eBook - Print a. What is the change in cash during 2019? b. Determine the change in net working capital in 2019. c. Determine the cash flow generated by the firm's assets during 2019. Change in cash Change in net working capital Cash flow from assets c. $ 20