must be done in excel please and thank you. provide formulas.

IRR AND NPV A company is analyzing two mutually exclusive projects, S and L, with the following cash flows: 11-12 4 $250 $250 $25 $845 $25 $870 Project S Project L -$1,000 -$1,000 $400 $0 The company's WACC is 8.5%. What is the IRR of the better project? (Hint: The betterlproj- ect may or may not be the one with the higher IRR.)