answer without using excel!

Both Bond Sam and Bond Dave have 8 percent coupons, make semiannual payments, and are priced at par value. Bond Sam has 2 years to maturity, whereas Bond Dave has 20 years to maturity. If interest rates suddenly rise by 5 percent, what is the percentage change in the price of Bond Sam? 8.56%9.37%8.79%8.54% If interest rates suddenly rise by 5 percent, what is the percentage change in the price of Bond Dave? 42.79%54.71%35.34%35.36% If rates were to suddenly fall by 5 percent instead, what would the percentage change in the price of Bond Sam be then? 9.62%8.51%8.79%9.64% If rates were to suddenly fall by 5 percent instead, what would the percentage change in the price of Bond Dave be then? 74.79%74.77%42.79%35.31% Both Bond Sam and Bond Dave have 8 percent coupons, make semiannual payments, and are priced at par value. Bond Sam has 2 years to maturity, whereas Bond Dave has 20 years to maturity. If interest rates suddenly rise by 5 percent, what is the percentage change in the price of Bond Sam? 8.56%9.37%8.79%8.54% If interest rates suddenly rise by 5 percent, what is the percentage change in the price of Bond Dave? 42.79%54.71%35.34%35.36% If rates were to suddenly fall by 5 percent instead, what would the percentage change in the price of Bond Sam be then? 9.62%8.51%8.79%9.64% If rates were to suddenly fall by 5 percent instead, what would the percentage change in the price of Bond Dave be then? 74.79%74.77%42.79%35.31%