A $10-$year corporate bond has a coupon rate of $x\%$ with annual payments. If interest rates rise to $8\%$ on similar bonds, then what is the value of the bond in the marketplace?

A $10-$year corporate bond has a coupon rate of $x\%$ with quarterly payments. If interest rates rise to $8\%$ on similar bonds, then what is the value of the bond in the marketplace?

A $100-$year corporate bond has a coupon rate of $x\%$ with annual payments. If interest rates drop to $4\%$ on similar bonds, then what is the value of the bond in the marketplace?