Hints:

Weighted average duration of assets or liabilities $=\frac{(\text{M}\text{a}\text{r}\text{k}\text{e}\text{t}\text{V}\text{a}\text{l}\text{u}\text{e}\text{D}\text{u}\text{r}\text{a}\text{t}\text{i}\text{o}\text{n})}{(\text{M}\text{a}\text{r}\text{k}\text{e}\text{t}\text{V}\text{a}\text{l}\text{u}\text{e})}$

Duration Gap $=$ Duration of Assets $-\frac{(Liabilities)}{(\text{A}\text{s}\text{s}\text{e}\text{t}\text{s})}*$ Duration of liabilities

$\%$ Change in Net Worth Duration Gap$)*$ Change in interest rate