\(11\%\)
\(10\%\)
\(5\%\)
\(5.5\%\)
The correct option is (C): \(5\%\) .
An electricity utility company charges ₹7 per kWh. 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?