Calculate the NPV of a project requiring an investment of $20000 on Day1, and which receives gross receipts at the end of Years 1, 2, 3 of $8000, $10000, $8000 respectively plus a further bonus of $2000 after 3 years. Assume the discount rate is 10% pa for Years 1 and 2 and then falls to 5%pa. Inflation is running at 2% throughout. State clearly how you calculate the answer(s).