please solve the question step by step

Question 1 [1 Mark] An investment with a first cost of $100,000 resulted in an income of $5,000 per year for 8 years and an extra income of $140,000 in year 7. There is no salvage value for this investment. Find the ROR for this investment. (a) Hand calculations (b) Spreadsheet Function (RATE or IRR) (c) If the MARR =12%, should the company invest in this project