So, if you can do all 3 thats great but I really just need part a and b. I have the solutions which are, a) Before Tax Rate of Return irr = 15.4% per year b) After Tax Rate of Return = 11.5%. I need to know how to get these values and I think I am required to use present worth equations to solve them. If you could show the work of how to get A and B solutions that would be much appreciated!

The effective combined tax rate in a firm is 28%. An outlay of $2 million for certain new assets is under consideration. Over the next 9 years, these assets will be responsible for annual receipts of $650,000 and annual disbursements (other than for income taxes) of $225,000. After this time, they will be used only for stand-by purposes with no future excess of receipts over disbursements. (a) What is the prospective rate of return before income taxes? (b) What is the prospective rate of return after taxes if straight-line depreciation can be used to write off these assets for tax purposes in 9 years? (c) What is the prospective rate of return after taxes if it is assumed that these assets must be written off for tax purposes over the next 20 years, using straight-line depreciation