Mike is in high school and decides to sell a bunch of candy bars. Principal Aquilina and Officer Chazick confiscate Mike’s candy bar earnings in December and put a stop to his business. Mike was selling $800 a week in candy bars (paid at the end of each week) and the candy bars cost him $200 a week to buy. There were 20 weeks left in the school year when he was shut down. If the interest rate is 0.5% per week, what was the present value of his lost future earnings when he was shut down?