Answer
$C=\$4.06/year$
Work Step by Step
$m=5\ kg/pan\times 3\ pans/week \times 52\ weeks/year=780\ kg/year$
$Q=mc\Delta T$
$c=3.90\ kJ/kg.°C,\ \Delta T=(95-23)°C=72°C$
$Q=219.02\ MJ/year$
$E=Q/COP,\ COP=1.5$
$E=40.56\ kWh/year$
$C=E\times p,\ p=\$0.10/kWh$
$C=\$4.06/year$
