please show formula

Exercise 06 Should we proceed with a project that has initial cost of $1,000, cost of capital 15% and the following expected year-end cash flows? Year 0 1 2 3 4 5 6 Cash flows ($) -1,000 100 200 300 400 500 600 Project IRR Using Excel's IRR function IRR NPV ($) Using Excel's Goalseek IRR NPV ($) Using Excel's Solver