Example $4\mathrm{.}5$

For the bond in Table $4\mathrm{.}6,$ the bond price, $B,$ is $94\mathrm{.}213$ and the duration, $D,$ is $2\mathrm{.}653,$ so that equation $(4\mathrm{.}15)$ gives

$B=-94\mathrm{.}2132\mathrm{.}653y$

or

$B=-249\mathrm{.}95y$

When the yield on the bond increases by $10$ basis points

Please show exact steps to how to slove problem