Please use "Only" the "Duration" formula below to answer Questions $13$ to Question $16$

Duration $=-,\frac{\text{P}\text{e}\text{r}\text{c}\text{e}\text{n}\text{t}\text{a}\text{g}\text{e}\text{C}\text{h}\text{a}\text{n}\text{g}\text{e}in\text{B}\text{o}\text{n}\text{d}\text{P}\text{r}\text{i}\text{c}\text{e}}{\text{Y}\text{i}\text{e}\text{l}\text{d}\text{C}\text{h}\text{a}\text{n}\text{g}\text{e}in\text{P}\text{e}\text{r}\text{c}\text{e}\text{n}\text{t}}$

If a bond's yield rise from $6\%$ to $8\%$ and its price falls $1\mathrm{.}5\%,$ calculate the duration

If a bond's yield decrease by $0\mathrm{.}3\%$ and its price increase by $\mathrm{.}5\%,$ calculate its duration

A bond is currently trading at $$1,025$ has a yield of $6\mathrm{.}82\%$ and has a duration of $6\mathrm{.}25.$ If the yield rises to $7\mathrm{.}5\%,$ calculate the new price of the bond