An installation consists of an electric motor which drives a water pump to lift $75 \mathrm{L}$ of water per second to a height of $5\mathrm{ }\mathrm{m}$, where water is disbursed at negligible speed. If the motor consumes a power of $5 \mathrm{kW}$, then what is the efficiency (%) of the installation? [$\mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}$]