Both Bond Sam and Bond Dave have 9 percent coupons, make semiannual payments, and are priced at par value. Bond Sam has two years to maturity, whereas Bond Dave has 15 years to maturity.

If interest rates suddenly rise by 5 percent, what is the percentage change in the price of Bond Sam and Bond Dave? If interest rates were to suddenly fall by 5 percent instead, what would the percentage change in the price of Bond Sam and Dave be?