An electricity utility company charges ₹ $7$ per kWh (kilo watt-hour). If a $40$ -watt desk light is left on for $10$ hours each night for $180$ days, what would be the cost of energy consumption? If the desk light is on for $2$ more hours each night for the $180$ days, what would be the percentage-increase in the cost of energy consumption?
- ₹ $604.8 ; 10 \%$
- ₹ $504 ; 20 \%$
- ₹ $604.8 ; 12 \%$
- ₹ $720 ; 15 \%$
