\textbf{199-} The isobaric pressure of an ideal gas is $5\times10^4\,\text{Pa}$ and its internal energy is $600\,\text{J}$. If we double the volume of the gas and also double the internal energy of the gas, how many joules will the internal energy of the gas be?
$$(P_\circ = 10^5\,\text{Pa})$$
(1) $800$ \hfill (2) $1250$ \hfill (3) $1600$ \hfill (4) $2400$
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