\textbf{152-} A piece of lead is at a temperature of $20^\circ$C and has a volume. If we increase the temperature of this piece to $200^\circ$C, by what percentage does its volume increase?
$$\left(\frac{1}{^\circ\text{C}} = 3\times10^{-5} = \text{coefficient of linear expansion of lead}\right)$$
(1) $0.6$ \hfill (2) $1.8$ \hfill (3) $6$ \hfill (4) $18$
\bigskip