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Total energy and costs: <br> Total energy: `E_("tot") = E_("water") + E_("air") + E_("loss") =1316 MJ + 12 MJ + 1556 MJ = 2884 MJ` <br> 2882 MJ corresponds to `2.884 xx 106 KJ xx (3600 s H^(-1) xx 9.981 KJ s^(-1) m^(-3) xx 0.9)^(-1)=89.18 m^(3)` <br> Volume of gas: `V=89.18 m^(3)` <br> 2884 MJ corresponds to a cost of : <br> `0.40€m^(-3) xx 89.18 m^(3) =35.67€` <br> Rent for equipment: 150.00€ <br> 2884 MJ correspond to a cost of <br> `2.884 xx 10^(6) KJ xx 0.137 € xx (3600 s h^(-1) xx 1 KJ s^(-1)h)^(-1) = 109.75 €` <br> Rent for equipment: 100.00€ <br> Total cost of electric heating : 209.75 €Solution :

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