PRM 1 Practice question 138

[Anonymous]

Hello,
Please i would need a better explanation for the following question 138.

Question 138 : How will the Macaulay duration of a 10 year coupon bearing bond change if 10 year zero rates stay the same but the yield curve changes from being flat to upward sloping?

(a) Will decrease

(b) Will be unaffected

(c) Will increase

(d) Cannot say without more information

I do not seem to understand the explanation provided in that question.

Thank you

[Author]

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