If 80 lamps can be lighted 5 hours per day for 10 days for Rs. 21.25,then the number of lamps which can be lighted 4 hours daily for 30days for Rs. 76.50, is?  Choose the correct choice from the following answers.
A) 100 B) 110 C) 120 D) 130 E) None of these
Explanation :   (Hrs/Day 4: 5) : (Money 21.25 :76.50) : (Days 30:10) : : 80 : x4 * 21.25 * 30 * x = 5 * 76.50 * 10 * 80 so x = 120   Answer : 120
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If 80 lamps can be lighted 5 hours per day for 10 days for Rs. 21.25,then the number of lamps which can be lighted 4 hours daily for 30days for Rs. 76.50, is?