Determine the point at which duration decreases with maturity for a 4 percent bond with an original

Question:

Determine the point at which duration decreases with maturity for a 4 percent bond with an original maturity of 15 years. Use increments in maturity of five years. The market yield on this bond is 15 percent.

Maturity
Maturity is the date on which the life of a transaction or financial instrument ends, after which it must either be renewed, or it will cease to exist. The term is commonly used for deposits, foreign exchange spot, and forward transactions, interest...