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Consider a bond selling at par with modified duration of 12 years and convexity of 265. A 1% decrease in yleld would cause the price to Increase by 12%, according to the duration rule. What would be the percentage price change according to the duration- with-convexity rule?
a. 21.2%
b. 13.3%
c. 25.4%
d. 17.0%