Gas density from a local pressure gauge

A sealed air accumulator is at $315\,\mathrm{K}$. Its pressure gauge reads $228\,\mathrm{kPa}$ above a local atmospheric pressure of $96\,\mathrm{kPa}$. Model the air as ideal with $R=0.287\,\mathrm{kJ/(kg\,K)}$. Determine the air density. Gauge pressure is defined relative to the local atmosphere.