Problem #1: For the following cash flows, (receipt of 10,000 at t=0; payment of 50,000 at t=1; receipt of 50,000 at t=3; and receipt of 30,000 at t=5), various interest rates are applied: 4% for year 1; 6% for years 2 and 3, and 5% for years 4 and 5. Find the equivalent net value at t=5, i.e., F5=?