Consider a Treasury portfolio consisting of a $124.6 million long 2-year zero-coupon Treasury with an annualized 2% yield-to-maturity and a short $25.41 million 10-year zero-coupon bond with a 4% yield-to-maturity. Calculate the net portfolio duration and solve for the first-order change in portfolio value based upon modified duration assuming a 25 bp rise in 2-year yield-to-maturity and a 30 bp decline in 10-year yield-to-maturity.