(a) On August 3rd, 2020, the yield (= market rate) for the 10-year US treasury bond hit an all-time low of r=0.515%. Currently, 2.5 years later, it is back up to 3.65%. If we had bought a 10-year bond on 8/3/20 how much value (in percent) would our bond have lost in that time? (assume R=0% for this calculation)