i am confused on how to get started solving for the IRR without excel for number 19. excel is okay but i need to see the formulas that are used please so i can understand it

b. Should this project be accepted if the required return is 12%? C1 Co -$10,000 C2 +$7,500 C3 +$8,500 0 19. NPV/IRR. Consider projects A and B: (LO8-2) Cash Flows (dollars) Project C1 C2 NPV at 10% A Co -30,000 -50,000 21,000 33,000 21,000 33,000 +$6,446 +7,273 B a. Calculate IRRs for A and B. b. Which project does the IRR rule suggest is best? c. Which project is really best? 20. IRR. You are offered the chance to participate in a project that produces the foll flows: C C2