\textbf{72.} In a pressure cooker, the area of the steam outlet is $5\,\text{mm}^2$. What should the mass of the weight placed on the outlet be so that the steam pressure inside the cooker reaches $1.5 \times 10^5$ pascals? $\left(g = 10\,\dfrac{\text{m}}{\text{s}^2}\right)$
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(1) $25$ \hspace{2em} (2) $25$ \hspace{2em} (3) $40$ \hspace{2em} (4) $50$
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