Four Different candles, which can last for 5 hours, 4 hours, 3 hours and 2 hours of burning, respectively, are lit in a room at the same instant and allowed to burn till such time that the three candles in the room get extinguished. The cost of burning each one of these candles is 75 paise per hour. The cost involved is:

Four Different candles, which can last for 5 hours, 4 hours, 3 hours a

1.	Four Different candles, which can last for 5 hours, 4 hours, 3 hours and 2 hours of burning, respectively, are lit in a room at the same instant and allowed to burn till such time that the three candles in the room get extinguished. The cost of burning each one of these candles is 75 paise per hour. The cost involved is:
A.	Rs. 2.75
B.	Rs. 3.75
C.	Rs. 9.75
D.	Rs 12.50
Answer» D. Rs 12.50