Maintaining a constant body temperature is critical for industrial workers in extreme environments. A steelworks operator working near a blast furnace monitored their fluid loss and daily energy balance.
On one of the shifts, the operator lost 3 800 cm33\text{ }800\text{ cm}^33 800 cm3 of water as sweat. Evaporation of 1 cm31\text{ cm}^31 cm3 of sweat requires 2.45 kJ2.45\text{ kJ}2.45 kJ of energy.
Calculate the energy the operator's body used for the evaporation of sweat on this shift.
On a different shift, the operator's body used 7 700 kJ7\text{ }700\text{ kJ}7 700 kJ of energy to evaporate sweat. The operator's total daily energy intake on that day was 22 000 kJ22\text{ }000\text{ kJ}22 000 kJ.
Calculate the percentage of the operator's daily energy intake used for the evaporation of sweat.