You are planning for a big trip once you finish your studies. The expected cost of your trip will be $5,000 per year for 3 years. You expect to leave 5 years from today. Assuming that you can get 7% return for your savings during the 5 years and 3 years of travel, how much money should you save per year (at the end of each year) to be able to complete your travel? Show your work.