Ritter Corporations accountants prepared the following financial statements for year-end 2021: (Do not round intermediate calculations.) RITTER CORPORATION Income Statement 2021 Revenue $ 781 Expenses 539 Depreciation 94 Net income $ 148 Dividends $ 115 RITTER CORPORATION Balance Sheet December 31 2020 2021 Assets Cash $ 65 $ 87 Other current assets 177 195 Net fixed assets 400 420 Total assets $ 642 $ 702 Liabilities and Equity Accounts payable $ 131 $ 149 Long-term debt 157 166 Stockholders equity 354 387 Total liabilities and equity $ 642 $ 702 a. What is the change in cash during 2021? b. Determine the change in net working capital in 2021. c. Determine the cash flow generated by the firms assets during 2021