Excel Online Structured Activity: NPV profiles been collected in the Microsoft Excel Online file below. Open the spreadsheet and perform the required analysis to answer the questions below. Open spreadsheet 10.55. Plan A: $ million Plan B: $ million Calculate each project's IRR. Round your answer to two decimal places. Plan A: % Plan B: % b. By graphing the NPV profiles for Plan A and Plan B, approximate the crossover rate to the nearest percent. % c. Calculate the crossover rate where the two projects' NPVs are equal. Round your answer to two decimal places. y0