Please show each working properly with an explanation for each step so that I understand

4. What is the IRR of the following problem. Sales are $2.1 Billion per year for 4 years. Initial investment in equipment is $1.1 billion (straight line depreciation over 4 years). The equipment can be sold for $200 million at the end (pre tax). Initial investment in net working capital is $75 million. There is an additional investment in net working capital of $50 million at the end of the first year. $20 million in net working capital is liquidated at the end of the third year. Costs excluding depreciation are $1.7 billion per year. Tax rate is 40%. 1 2 3 0 -1100 Initial 4 200 x.6 = 120 +105 NWC -75 -50 +20 OCF 350 350 350 350 300 350 370 575 Total -1175 IRR = 12.02% =