I need help doing j,k,l I did the others

Jenny Cochran, a graduate of the University of Tennessee with 4 years of experience as an equities analyst, was recently brought in as assistant to the chairman of the board of Computron Industries, a manufacturer of computer components. \begin{tabular}{lrr} & 2018 & 2019 \\ Other Data & $50.00 & $30.00 \\ Stock price & 100 & 100 \\ Shares outstanding (millions) & $90 & $84 \\ Common dividends (millions) & 25% & 25% \\ Tax rate & 10.00% & 10.00% \\ Weighted average cost of capital (WACC) & & \\ & & \\ Statement of Cash Flows (Millions of Dollars) & & \\ \hline Operating Activities & & \\ Net income before preferred dividends & & (1200 \\ Noncash Adjustments \\ Depreciation and amortization & & 1200 \\ Due to Changes in Working Capital & & 100 \\ Change in accounts receivable & & 40 \\ Change in inventories & $404 \end{tabular} Investing Activities Cash used to acquire fixed assets Change in short-term investments Net cash provided by investing activities $(920)90(830) Financing Activities Change in notes payable Change in long-term debt Payment of cash dividends Net cash provided by financing activities Net change in cash and equivalents Cash and securities at beginning of the year Cash and securities at end of the year $(10)60$50 Assume that you are Cochran's assistant and that you must help her answer the following questions: j. Assume that a corporation has $87 million of taxable income from operations. It also received interest income of $8 million and dividend income of $10 million. The federal tax rate is 21%, and the dividend exclusion rate is 50%. What is its taxable income and federal tax liability? k. Briefly describe the TCJA's key provisions for personal taxes. 1. Assume that you are in the 25% marginal tax bracket and that you have $20,000 to invest. You have narrowed your investment choices down to municipal bonds yielding 7% or equally risky corporate bonds with a yield of 10%. Which one should you