Work Done Questions

Under isothermal condition, a gas at 300K expands from 0.1L to 0.25L against a constant external pressure of 2bar. The work done by the gas is (Given that 1L bar=100J):

An ideal gas expands isothermally from $10^{-3}{\text{m}}^3$ to $10^{-2}{\text{m}}^3$ at $300\text{K}$ against a constant pressure of $10^5{\text{Nm}}^{-2}$. The work done by the gas is: