A girl of mass $35\mathrm{kg}$ climbs up from the first floor of a building at a height $4\mathrm{m}$ above the ground to the third floor at a height $12\mathrm{m}$ above the ground. What will be the increase in her gravitational potential energy ? ( $\mathit{g}=$ $10{\mathrm{ms}}^{-2}$ ).