\(H=\dfrac{Q_{thu}}{Q_{toa}}100\%=\dfrac{mc\Delta t}{Pt}100\%=\dfrac{10\cdot4200\cdot80}{1000\cdot1\cdot3600+10}100\%\approx93,1\%\)
\(A=Pt=1000\cdot\dfrac{7}{6}=\dfrac{3500}{3}\)Wh = \(\dfrac{7}{6}\)kWh
\(\Rightarrow T=A\cdot2100=\dfrac{7}{6}\cdot2100=2450\left(dong\right)\)
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