In a household,$5$ tube lights of $40 \text{ W}$ each are used for $5 \text{ hours}$ and an electric press of $500 \text{ W}$ for $4 \text{ hours}$ everyday. Calculate the total energy consumed by the tube lights and press in a month of $30 \text{ days}$.

$1$. Energy consumed by $5$ tube lights of $40 \text{ W}$ each for $5 \text{ hours}$ per day:
$E_1 = 5 \times 40 \text{ W} \times 5 \text{ h} = 1000 \text{ Wh} = 1 \text{ kWh}$.
$2$. Energy consumed by an electric press of $500 \text{ W}$ for $4 \text{ hours}$ per day:
$E_2 = 500 \text{ W} \times 4 \text{ h} = 2000 \text{ Wh} = 2 \text{ kWh}$.
$3$. Total energy consumed per day:
$E_{\text{total/day}} = 1 \text{ kWh} + 2 \text{ kWh} = 3 \text{ kWh}$.
$4$. Total energy consumed in a month of $30 \text{ days}$:
$E_{\text{month}} = 3 \text{ kWh/day} \times 30 \text{ days} = 90 \text{ kWh}$.