NPV BAII Calculator Workings

Hey Guys, I’m still getting used to my BAII and finding it difficult to work out the following: a) What would the steps be for calculating the NPV of a perpetual cash flow, with RR=10% and initial investment of $50 000 b)Cash flows of $5000 fro 5 years and a salvage value of $250 at the end of year 5 c)Given NPV and IRR of two projects calculate the discount rate that would eaqual the 2 projects I’ve tried some workings but dont know whether they are correct, any suggestions? Many thanks!!