please help

Both Bond Sam and Bond Dave have 12 percent coupons, make semiannual payments, and are priced at par value, Bond Sam has 3 years to maturty, whereas Bond Dave has 20 years to maturity. Both bonds have a par value of 1,000. a. If interest rates suddenly rise by 3 percent, what is the percentage change in the price of these bonds? Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answers os a percent rounded to 2 decimal places, e.9. 3216. b. If rates were to suddenly fall by 3 percent instead, what would be the percentage change in the price of these bonds? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16