how do i find the %increase and decrease? please show a detailed calculation so i can understand where the numbers come from.

1. Find the duration, modified duration, approx. value of the bond given a 1% and a 1/4% up or down change in rates. Check with the bond value calculation on your calculator. The bond is a $1000 par, 8% annual coupon bond with 5 years to maturity. The required rate of return on the bond is 9%