A hydraulic storage plant has a unit similar to that shown in Fig. $2-15.$ The efficiency of the generator$-$motor is $96\%,$ of the turbine $80\%,$ of the pump $75\%.$Average elevation between upper and lower pools $=100\text{'}.$ Assume a $2\%$ loss of head inpipe friction. This unit was installed to carry a daily peak load of $1400$ kw hr$.$ There is a daily evaporation loss of stored water amounting to $1000$ tons. Calculate the over$-$all efficiency of conversion.