boys = 900
girls = 1100
Passed = 32% of 900 + 38% of 1100 = 288 + 418 = 706
Failed = 2000 - 706 = 1294
Total % of failed candidates
= \(\frac{(2000 - 706) }{ 2000} \)
\(= \frac{1294}{2000} \)
\(= 64.7%\)
Therefore, the correct option is (B): 64.7%
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?