Ideal gas equation

A fixed mass of ideal gas expands at constant pressure from volume $1.5\times10^{-3}\,\text{m}^3$ to $3.1\times10^{-3}\,\text{m}^3$ at a pressure of $2.0\times10^{5}\,\text{Pa}$. Using the equation for work done in a constant-pressure process, calculate the work done by the gas.